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31205400000 = 2635552009
BaseRepresentation
bin11101000011111111…
…001001110111000000
32222112202110120022120
4131003333021313000
51002402040300000
622200252004240
72153204344365
oct350377116700
988482416276
1031205400000
11122636a8985
12606a760680
132c3402a438
14172058246c
15c2987e6a0
hex743fc9dc0

31205400000 has 168 divisors, whose sum is σ = 103200738480. Its totient is φ = 8321280000.

The previous prime is 31205399989. The next prime is 31205400041. The reversal of 31205400000 is 450213.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 573996 + ... + 626004.

It is an arithmetic number, because the mean of its divisors is an integer number (614290110).

Almost surely, 231205400000 is an apocalyptic number.

31205400000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31205400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51600369240).

31205400000 is an abundant number, since it is smaller than the sum of its proper divisors (71995338480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31205400000 is an frugal number, since it uses more digits than its factorization.

31205400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52049 (or 52019 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

Adding to 31205400000 its reverse (450213), we get a palindrome (31205850213).

The spelling of 31205400000 in words is "thirty-one billion, two hundred five million, four hundred thousand".