13978356500 has 24 divisors (see below), whose sum is σ = 30528731688. Its totient is φ = 5591342400.

The previous prime is 13978356493. The next prime is 13978356517. The reversal of 13978356500 is 565387931.

It can be written as a sum of positive squares in 4 ways, for example, as 961372036 + 13016984464 = 31006^2 + 114092^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 13977857 + ... + 13978856.

It is an arithmetic number, because the mean of its divisors is an integer number (1272030487).

Almost surely, 2^13978356500 is an apocalyptic number.

13978356500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13978356500 is an abundant number, since it is smaller than the sum of its proper divisors (16550375188).

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

13978356500 is a wasteful number, since it uses less digits than its factorization.

13978356500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27956732 (or 27956720 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 47.

The spelling of 13978356500 in words is "thirteen billion, nine hundred seventy-eight million, three hundred fifty-six thousand, five hundred".