55477272 has 16 divisors (see below), whose sum is σ = 138693240. Its totient is φ = 18492416.

The previous prime is 55477241. The next prime is 55477297. The reversal of 55477272 is 27277455.

It is a self number, because there is not a number n which added to its sum of digits gives 55477272.

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, 1155753 + ... + 1155800.

Almost surely, 2^55477272 is an apocalyptic number.

It is an amenable number.

55477272 is an abundant number, since it is smaller than the sum of its proper divisors (83215968).

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

55477272 is a wasteful number, since it uses less digits than its factorization.

55477272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311562 (or 2311558 counting only the distinct ones).

The product of its digits is 137200, while the sum is 39.

The square root of 55477272 is about 7448.3066531931. The cubic root of 55477272 is about 381.3921053344.

Adding to 55477272 its sum of digits (39), we get a triangular number (55477311 = T₁₀₅₃₃).

The spelling of 55477272 in words is "fifty-five million, four hundred seventy-seven thousand, two hundred seventy-two".