7698431538 has 64 divisors (see below), whose sum is σ = 20701681920. Its totient is φ = 2070164736.

The previous prime is 7698431537. The next prime is 7698431549. The reversal of 7698431538 is 8351348967.

7698431538 is a `hidden beast` number, since 7 + 69 + 8 + 43 + 1 + 538 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (7698431537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 592581 + ... + 605432.

It is an arithmetic number, because the mean of its divisors is an integer number (323463780).

Almost surely, 2^7698431538 is an apocalyptic number.

7698431538 is an abundant number, since it is smaller than the sum of its proper divisors (13003250382).

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

7698431538 is a wasteful number, since it uses less digits than its factorization.

7698431538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198048 (or 1198042 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 7698431538 is about 87740.7062770753. The cubic root of 7698431538 is about 1974.5467346733.

The spelling of 7698431538 in words is "seven billion, six hundred ninety-eight million, four hundred thirty-one thousand, five hundred thirty-eight".