55642772 has 6 divisors (see below), whose sum is σ = 97374858. Its totient is φ = 27821384.

The previous prime is 55642759. The next prime is 55642787. The reversal of 55642772 is 27724655.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55562116 + 80656 = 7454^2 + 284^2 .

It is a super-2 number, since 2×55642772² = 6192236151687968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6955343 + ... + 6955350.

It is an arithmetic number, because the mean of its divisors is an integer number (16229143).

Almost surely, 2^55642772 is an apocalyptic number.

It is an amenable number.

55642772 is a deficient number, since it is larger than the sum of its proper divisors (41732086).

55642772 is a wasteful number, since it uses less digits than its factorization.

55642772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13910697 (or 13910695 counting only the distinct ones).

The product of its digits is 117600, while the sum is 38.

The square root of 55642772 is about 7459.4082875252. The cubic root of 55642772 is about 381.7709855977.

The spelling of 55642772 in words is "fifty-five million, six hundred forty-two thousand, seven hundred seventy-two".