31420780765920 has 768 divisors, whose sum is σ = 136152237312000. Its totient is φ = 6629425440768.

The previous prime is 31420780765919. The next prime is 31420780765931. The reversal of 31420780765920 is 2956708702413.

It is a happy number.

31420780765920 is a `hidden beast` number, since 3 + 1 + 42 + 0 + 7 + 8 + 0 + 7 + 6 + 592 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 66200811 + ... + 66673749.

It is an arithmetic number, because the mean of its divisors is an integer number (177281559000).

It is a 1-persistent number, because it is pandigital, but 2⋅31420780765920 = 62841561531840 is not.

Almost surely, 2^{31420780765920} is an apocalyptic number.

31420780765920 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 31420780765920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68076118656000).

31420780765920 is an abundant number, since it is smaller than the sum of its proper divisors (104731456546080).

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

31420780765920 is a wasteful number, since it uses less digits than its factorization.

31420780765920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473009 (or 472969 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 31420780765920 in words is "thirty-one trillion, four hundred twenty billion, seven hundred eighty million, seven hundred sixty-five thousand, nine hundred twenty".