55169720 has 64 divisors (see below), whose sum is σ = 128066400. Its totient is φ = 21381120.

The previous prime is 55169717. The next prime is 55169761. The reversal of 55169720 is 2796155.

55169720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228800 + ... + 229040.

Almost surely, 2^55169720 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 55169720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64033200).

55169720 is an abundant number, since it is smaller than the sum of its proper divisors (72896680).

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

55169720 is a wasteful number, since it uses less digits than its factorization.

55169720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 55169720 is about 7427.6321933709. The cubic root of 55169720 is about 380.6860183955.

The spelling of 55169720 in words is "fifty-five million, one hundred sixty-nine thousand, seven hundred twenty".