55987775 has 24 divisors (see below), whose sum is σ = 73507200. Its totient is φ = 42184800.

The previous prime is 55987759. The next prime is 55987781. The reversal of 55987775 is 57778955.

It is a happy number.

It is not a de Polignac number, because 55987775 - 2⁴ = 55987759 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147536 + ... + 147914.

It is an arithmetic number, because the mean of its divisors is an integer number (3062800).

Almost surely, 2^55987775 is an apocalyptic number.

55987775 is a deficient number, since it is larger than the sum of its proper divisors (17519425).

55987775 is a wasteful number, since it uses less digits than its factorization.

55987775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 714 counting only the distinct ones).

The product of its digits is 3087000, while the sum is 53.

The square root of 55987775 is about 7482.4979117939. The cubic root of 55987775 is about 382.5583945478.

The spelling of 55987775 in words is "fifty-five million, nine hundred eighty-seven thousand, seven hundred seventy-five".