55231772 has 12 divisors (see below), whose sum is σ = 96838056. Its totient is φ = 27563760.

The previous prime is 55231751. The next prime is 55231783. The reversal of 55231772 is 27713255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10598 + ... + 14925.

It is an arithmetic number, because the mean of its divisors is an integer number (8069838).

Almost surely, 2^55231772 is an apocalyptic number.

It is an amenable number.

55231772 is a deficient number, since it is larger than the sum of its proper divisors (41606284).

55231772 is a wasteful number, since it uses less digits than its factorization.

55231772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26068 (or 26066 counting only the distinct ones).

The product of its digits is 14700, while the sum is 32.

The square root of 55231772 is about 7431.8081245414. The cubic root of 55231772 is about 380.8286901241.

The spelling of 55231772 in words is "fifty-five million, two hundred thirty-one thousand, seven hundred seventy-two".