55987771 has 16 divisors (see below), whose sum is σ = 66331584. Its totient is φ = 46255104.

The previous prime is 55987759. The next prime is 55987781. The reversal of 55987771 is 17778955.

It is not a de Polignac number, because 55987771 - 2⁵ = 55987739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55987751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28311 + ... + 30223.

It is an arithmetic number, because the mean of its divisors is an integer number (4145724).

Almost surely, 2^55987771 is an apocalyptic number.

55987771 is a deficient number, since it is larger than the sum of its proper divisors (10343813).

55987771 is a wasteful number, since it uses less digits than its factorization.

55987771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its digits is 617400, while the sum is 49.

The square root of 55987771 is about 7482.4976445035. The cubic root of 55987771 is about 382.5583854372.

The spelling of 55987771 in words is "fifty-five million, nine hundred eighty-seven thousand, seven hundred seventy-one".