690564857 has 4 divisors (see below), whose sum is σ = 720589440. Its totient is φ = 660540276.

The previous prime is 690564841. The next prime is 690564863. The reversal of 690564857 is 758465096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690564857 - 2⁴ = 690564841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690564817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15012257 + ... + 15012302.

It is an arithmetic number, because the mean of its divisors is an integer number (180147360).

Almost surely, 2^690564857 is an apocalyptic number.

It is an amenable number.

690564857 is a deficient number, since it is larger than the sum of its proper divisors (30024583).

690564857 is a wasteful number, since it uses less digits than its factorization.

690564857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30024582.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 690564857 is about 26278.6007428097. The cubic root of 690564857 is about 883.8966564456.

The spelling of 690564857 in words is "six hundred ninety million, five hundred sixty-four thousand, eight hundred fifty-seven".