250640690 has 16 divisors (see below), whose sum is σ = 477691992. Its totient is φ = 94358784.

The previous prime is 250640681. The next prime is 250640711. The reversal of 250640690 is 96046052.

It can be written as a sum of positive squares in 4 ways, for example, as 148084561 + 102556129 = 12169^2 + 10127^2 .

It is a super-2 number, since 2×250640690² = 125641510967352200, which contains 22 as substring.

It is a Curzon number.

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, 737009 + ... + 737348.

Almost surely, 2^250640690 is an apocalyptic number.

250640690 is a deficient number, since it is larger than the sum of its proper divisors (227051302).

250640690 is a wasteful number, since it uses less digits than its factorization.

250640690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474381.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 250640690 is about 15831.6357335558. The cubic root of 250640690 is about 630.4982117662.

The spelling of 250640690 in words is "two hundred fifty million, six hundred forty thousand, six hundred ninety".