978618400731 has 48 divisors (see below), whose sum is σ = 1494990937440. Its totient is φ = 639494818560.

The previous prime is 978618400699. The next prime is 978618400751. The reversal of 978618400731 is 137004816879.

978618400731 is a `hidden beast` number, since 97 + 86 + 1 + 8 + 400 + 73 + 1 = 666.

It is not a de Polignac number, because 978618400731 - 2⁵ = 978618400699 is a prime.

It is a super-2 number, since 2×978618400731² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (978618400751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13732111 + ... + 13803191.

It is an arithmetic number, because the mean of its divisors is an integer number (31145644530).

Almost surely, 2^978618400731 is an apocalyptic number.

978618400731 is a deficient number, since it is larger than the sum of its proper divisors (516372536709).

978618400731 is a wasteful number, since it uses less digits than its factorization.

978618400731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72218 (or 72206 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 978618400731 in words is "nine hundred seventy-eight billion, six hundred eighteen million, four hundred thousand, seven hundred thirty-one".