690236857 has 4 divisors (see below), whose sum is σ = 693277776. Its totient is φ = 687195940.

The previous prime is 690236849. The next prime is 690236863. The reversal of 690236857 is 758632096.

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 690236857 - 2³ = 690236849 is a prime.

It is a super-2 number, since 2×690236857² = 952853837522476898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690236837) 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, 1520119 + ... + 1520572.

It is an arithmetic number, because the mean of its divisors is an integer number (173319444).

Almost surely, 2^690236857 is an apocalyptic number.

It is an amenable number.

690236857 is a deficient number, since it is larger than the sum of its proper divisors (3040919).

690236857 is a wasteful number, since it uses less digits than its factorization.

690236857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040918.

The product of its (nonzero) digits is 544320, while the sum is 46.

The square root of 690236857 is about 26272.3591822280. The cubic root of 690236857 is about 883.7566917903.

The spelling of 690236857 in words is "six hundred ninety million, two hundred thirty-six thousand, eight hundred fifty-seven".