13135907720 has 32 divisors (see below), whose sum is σ = 31829316120. Its totient is φ = 4850181120.

The previous prime is 13135907663. The next prime is 13135907737. The reversal of 13135907720 is 2770953131.

It can be written as a sum of positive squares in 4 ways, for example, as 7433543524 + 5702364196 = 86218^2 + 75514^2 .

It is a super-3 number, since 3×13135907720³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12630161 + ... + 12631200.

Almost surely, 2^13135907720 is an apocalyptic number.

13135907720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13135907720 is an abundant number, since it is smaller than the sum of its proper divisors (18693408400).

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

13135907720 is a wasteful number, since it uses less digits than its factorization.

13135907720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25261385 (or 25261381 counting only the distinct ones).

The product of its (nonzero) digits is 39690, while the sum is 38.

The spelling of 13135907720 in words is "thirteen billion, one hundred thirty-five million, nine hundred seven thousand, seven hundred twenty".