55621288 has 32 divisors (see below), whose sum is σ = 106313760. Its totient is φ = 27276480.

The previous prime is 55621277. The next prime is 55621367. The reversal of 55621288 is 88212655.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139906 + ... + 140302.

It is an arithmetic number, because the mean of its divisors is an integer number (3322305).

Almost surely, 2^55621288 is an apocalyptic number.

It is an amenable number.

55621288 is a deficient number, since it is larger than the sum of its proper divisors (50692472).

55621288 is a wasteful number, since it uses less digits than its factorization.

55621288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 693 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 55621288 is about 7457.9680878910. The cubic root of 55621288 is about 381.7218446018.

The spelling of 55621288 in words is "fifty-five million, six hundred twenty-one thousand, two hundred eighty-eight".