55911690 has 24 divisors (see below), whose sum is σ = 145370628. Its totient is φ = 14909760.

The previous prime is 55911679. The next prime is 55911703. The reversal of 55911690 is 9611955.

55911690 = 3342² + 3343² + ... + 3346².

55911690 is a `hidden beast` number, since 5 + 591 + 1 + 69 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 54331641 + 1580049 = 7371^2 + 1257^2 .

It is a super-2 number, since 2×55911690² = 6252234157312200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310531 + ... + 310710.

Almost surely, 2^55911690 is an apocalyptic number.

55911690 is an abundant number, since it is smaller than the sum of its proper divisors (89458938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55911690 is a wasteful number, since it uses less digits than its factorization.

55911690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621254 (or 621251 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 55911690 is about 7477.4119854399. The cubic root of 55911690 is about 382.3850224712.

The spelling of 55911690 in words is "fifty-five million, nine hundred eleven thousand, six hundred ninety".