55178720 has 48 divisors (see below), whose sum is σ = 131090400. Its totient is φ = 21947904.

The previous prime is 55178713. The next prime is 55178731. The reversal of 55178720 is 2787155.

It is a super-2 number, since 2×55178720² = 6089382281676800, 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 in 7 ways as a sum of consecutive naturals, for example, 30974 + ... + 32706.

It is an arithmetic number, because the mean of its divisors is an integer number (2731050).

Almost surely, 2^55178720 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 55178720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65545200).

55178720 is an abundant number, since it is smaller than the sum of its proper divisors (75911680).

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

55178720 is a wasteful number, since it uses less digits than its factorization.

55178720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 55178720 is about 7428.2380144958. The cubic root of 55178720 is about 380.7067180829.

The spelling of 55178720 in words is "fifty-five million, one hundred seventy-eight thousand, seven hundred twenty".