690666057 has 24 divisors (see below), whose sum is σ = 1050251904. Its totient is φ = 436512384.

The previous prime is 690666047. The next prime is 690666127. The reversal of 690666057 is 750666096.

It is not a de Polignac number, because 690666057 - 2¹⁸ = 690403913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690666047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8628 + ... + 38154.

It is an arithmetic number, because the mean of its divisors is an integer number (43760496).

Almost surely, 2^690666057 is an apocalyptic number.

It is an amenable number.

690666057 is a deficient number, since it is larger than the sum of its proper divisors (359585847).

690666057 is a wasteful number, since it uses less digits than its factorization.

690666057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29669 (or 29666 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 690666057 is about 26280.5261933623. The cubic root of 690666057 is about 883.9398317156.

The spelling of 690666057 in words is "six hundred ninety million, six hundred sixty-six thousand, fifty-seven".