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13206928680 = 233251171107439
BaseRepresentation
bin11000100110011000…
…11011110100101000
31021002102011111020200
430103030123310220
5204021433204210
610022302152200
7645165020151
oct142314336450
937072144220
1013206928680
115667a6aaa0
122686b82660
1313262138ca
148d4032928
155246c90c0
hex31331bd28

13206928680 has 384 divisors, whose sum is σ = 48037017600. Its totient is φ = 3119961600.

The previous prime is 13206928661. The next prime is 13206928681. The reversal of 13206928680 is 8682960231.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (13206928681) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 30083901 + ... + 30084339.

It is an arithmetic number, because the mean of its divisors is an integer number (125096400).

Almost surely, 213206928680 is an apocalyptic number.

13206928680 is a gapful number since it is divisible by the number (10) 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 13206928680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24018508800).

13206928680 is an abundant number, since it is smaller than the sum of its proper divisors (34830088920).

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

13206928680 is a wasteful number, since it uses less digits than its factorization.

13206928680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 13206928680 in words is "thirteen billion, two hundred six million, nine hundred twenty-eight thousand, six hundred eighty".