697679138 has 16 divisors (see below), whose sum is σ = 1132083456. Its totient is φ = 320559120.

The previous prime is 697679137. The next prime is 697679197. The reversal of 697679138 is 831976796.

697679138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (697679131) 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, 54368 + ... + 65963.

It is an arithmetic number, because the mean of its divisors is an integer number (70755216).

Almost surely, 2^697679138 is an apocalyptic number.

697679138 is a deficient number, since it is larger than the sum of its proper divisors (434404318).

697679138 is a wasteful number, since it uses less digits than its factorization.

697679138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120569.

The product of its digits is 3429216, while the sum is 56.

The square root of 697679138 is about 26413.6165263297. The cubic root of 697679138 is about 886.9216282697.

The spelling of 697679138 in words is "six hundred ninety-seven million, six hundred seventy-nine thousand, one hundred thirty-eight".