696643638 has 16 divisors (see below), whose sum is σ = 1397686320. Its totient is φ = 231481376.

The previous prime is 696643631. The next prime is 696643639. The reversal of 696643638 is 836346696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (696643631) 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, 181233 + ... + 185036.

It is an arithmetic number, because the mean of its divisors is an integer number (87355395).

Almost surely, 2^696643638 is an apocalyptic number.

696643638 is an abundant number, since it is smaller than the sum of its proper divisors (701042682).

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

696643638 is a wasteful number, since it uses less digits than its factorization.

696643638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366591.

The product of its digits is 3359232, while the sum is 51.

The square root of 696643638 is about 26394.0076153660. The cubic root of 696643638 is about 886.4826193519.

The spelling of 696643638 in words is "six hundred ninety-six million, six hundred forty-three thousand, six hundred thirty-eight".