55732820 has 72 divisors (see below), whose sum is σ = 138348000. Its totient is φ = 18695040.

The previous prime is 55732801. The next prime is 55732837. The reversal of 55732820 is 2823755.

It is a super-2 number, since 2×55732820² = 6212294450304800, 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 23 ways as a sum of consecutive naturals, for example, 36431 + ... + 37929.

It is an arithmetic number, because the mean of its divisors is an integer number (1921500).

Almost surely, 2^55732820 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 55732820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69174000).

55732820 is an abundant number, since it is smaller than the sum of its proper divisors (82615180).

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

55732820 is a wasteful number, since it uses less digits than its factorization.

55732820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 55732820 is about 7465.4417149958. The cubic root of 55732820 is about 381.9768175766.

The spelling of 55732820 in words is "fifty-five million, seven hundred thirty-two thousand, eight hundred twenty".