13257751240 has 32 divisors (see below), whose sum is σ = 31584644280. Its totient is φ = 4991153152.

The previous prime is 13257751217. The next prime is 13257751249. The reversal of 13257751240 is 4215775231.

It can be written as a sum of positive squares in 4 ways, for example, as 10010802916 + 3246948324 = 100054^2 + 56982^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13257751240.

It is not an unprimeable number, because it can be changed into a prime (13257751249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9747667 + ... + 9749026.

Almost surely, 2^13257751240 is an apocalyptic number.

13257751240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13257751240 is an abundant number, since it is smaller than the sum of its proper divisors (18326893040).

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

13257751240 is a wasteful number, since it uses less digits than its factorization.

13257751240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19496721 (or 19496717 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 13257751240 in words is "thirteen billion, two hundred fifty-seven million, seven hundred fifty-one thousand, two hundred forty".