55987722 has 24 divisors (see below), whose sum is σ = 138636576. Its totient is φ = 15996456.

The previous prime is 55987693. The next prime is 55987739. The reversal of 55987722 is 22778955.

It is a happy number.

55987722 is a `hidden beast` number, since 559 + 8 + 77 + 22 = 666.

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, 222048 + ... + 222299.

It is an arithmetic number, because the mean of its divisors is an integer number (5776524).

Almost surely, 2^55987722 is an apocalyptic number.

55987722 is an abundant number, since it is smaller than the sum of its proper divisors (82648854).

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

55987722 is a wasteful number, since it uses less digits than its factorization.

55987722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444362 (or 444359 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 55987722 is about 7482.4943701950. The cubic root of 55987722 is about 382.5582738333.

The spelling of 55987722 in words is "fifty-five million, nine hundred eighty-seven thousand, seven hundred twenty-two".