55072320 has 56 divisors (see below), whose sum is σ = 174857664. Its totient is φ = 14685696.

The previous prime is 55072319. The next prime is 55072343. The reversal of 55072320 is 2327055.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 27724 + ... + 29643.

Almost surely, 2^55072320 is an apocalyptic number.

It is an amenable number.

55072320 is an abundant number, since it is smaller than the sum of its proper divisors (119785344).

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

55072320 is a wasteful number, since it uses less digits than its factorization.

55072320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57387 (or 57377 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 55072320 is about 7421.0726987411. The cubic root of 55072320 is about 380.4618576299.

Adding to 55072320 its reverse (2327055), we get a palindrome (57399375).

The spelling of 55072320 in words is "fifty-five million, seventy-two thousand, three hundred twenty".