612289690 has 32 divisors (see below), whose sum is σ = 1147464720. Its totient is φ = 235021824.

The previous prime is 612289681. The next prime is 612289747. The reversal of 612289690 is 96982216.

It can be written as a sum of positive squares in 8 ways, for example, as 562685841 + 49603849 = 23721^2 + 7043^2 .

It is a super-2 number, since 2×612289690² = 749797328960592200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15676 + ... + 38344.

Almost surely, 2^612289690 is an apocalyptic number.

612289690 is a deficient number, since it is larger than the sum of its proper divisors (535175030).

612289690 is a wasteful number, since it uses less digits than its factorization.

612289690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22786.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 612289690 is about 24744.4880731043. The cubic root of 612289690 is about 849.1524146189.

The spelling of 612289690 in words is "six hundred twelve million, two hundred eighty-nine thousand, six hundred ninety".