55038720 has 144 divisors (see below), whose sum is σ = 191907072. Its totient is φ = 13332480.

The previous prime is 55038719. The next prime is 55038749. The reversal of 55038720 is 2783055.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41589 + ... + 42891.

It is an arithmetic number, because the mean of its divisors is an integer number (1332688).

Almost surely, 2^55038720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55038720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95953536).

55038720 is an abundant number, since it is smaller than the sum of its proper divisors (136868352).

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

55038720 is a wasteful number, since it uses less digits than its factorization.

55038720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 55038720 is about 7418.8085296764. The cubic root of 55038720 is about 380.3844677598.

It can be divided in two parts, 5 and 5038720, that added together give a triangular number (5038725 = T₃₁₇₄).

The spelling of 55038720 in words is "fifty-five million, thirty-eight thousand, seven hundred twenty".