15216735640 has 32 divisors (see below), whose sum is σ = 35342098560. Its totient is φ = 5890348800.

The previous prime is 15216735617. The next prime is 15216735647. The reversal of 15216735640 is 4653761251.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15216735593 and 15216735602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15216735647) 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, 6134541 + ... + 6137020.

It is an arithmetic number, because the mean of its divisors is an integer number (1104440580).

Almost surely, 2^15216735640 is an apocalyptic number.

15216735640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15216735640 is an abundant number, since it is smaller than the sum of its proper divisors (20125362920).

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

15216735640 is a wasteful number, since it uses less digits than its factorization.

15216735640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12271603 (or 12271599 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 15216735640 in words is "fifteen billion, two hundred sixteen million, seven hundred thirty-five thousand, six hundred forty".