55911986 has 24 divisors (see below), whose sum is σ = 91659204. Its totient is φ = 25427520.

The previous prime is 55911967. The next prime is 55912009. The reversal of 55911986 is 68911955.

It can be written as a sum of positive squares in 6 ways, for example, as 10686361 + 45225625 = 3269^2 + 6725^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308816 + ... + 308996.

Almost surely, 2^55911986 is an apocalyptic number.

55911986 is a deficient number, since it is larger than the sum of its proper divisors (35747218).

55911986 is a wasteful number, since it uses less digits than its factorization.

55911986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 305 counting only the distinct ones).

The product of its digits is 97200, while the sum is 44.

The square root of 55911986 is about 7477.4317783581. The cubic root of 55911986 is about 382.3856972601.

The spelling of 55911986 in words is "fifty-five million, nine hundred eleven thousand, nine hundred eighty-six".