253681690 has 8 divisors (see below), whose sum is σ = 456627060. Its totient is φ = 101472672.

The previous prime is 253681613. The next prime is 253681717. The reversal of 253681690 is 96186352.

253681690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 227436561 + 26245129 = 15081^2 + 5123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×253681690² = 128708799682512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12684075 + ... + 12684094.

Almost surely, 2^253681690 is an apocalyptic number.

253681690 is a deficient number, since it is larger than the sum of its proper divisors (202945370).

253681690 is a wasteful number, since it uses less digits than its factorization.

253681690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25368176.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 253681690 is about 15927.3880470088. The cubic root of 253681690 is about 633.0378932898.

The spelling of 253681690 in words is "two hundred fifty-three million, six hundred eighty-one thousand, six hundred ninety".