690875642 has 16 divisors (see below), whose sum is σ = 1072996200. Its totient is φ = 333231360.

The previous prime is 690875639. The next prime is 690875683. The reversal of 690875642 is 246578096.

It can be written as a sum of positive squares in 4 ways, for example, as 679592761 + 11282881 = 26069^2 + 3359^2 .

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, 70142 + ... + 79382.

Almost surely, 2^690875642 is an apocalyptic number.

690875642 is a deficient number, since it is larger than the sum of its proper divisors (382120558).

690875642 is a wasteful number, since it uses less digits than its factorization.

690875642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 690875642 is about 26284.5133491187. The cubic root of 690875642 is about 884.0292342045.

The spelling of 690875642 in words is "six hundred ninety million, eight hundred seventy-five thousand, six hundred forty-two".