55633820 has 24 divisors (see below), whose sum is σ = 127452528. Its totient is φ = 20230400.

The previous prime is 55633807. The next prime is 55633847. The reversal of 55633820 is 2833655.

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, 126221 + ... + 126660.

It is an arithmetic number, because the mean of its divisors is an integer number (5310522).

Almost surely, 2^55633820 is an apocalyptic number.

It is an amenable number.

55633820 is an abundant number, since it is smaller than the sum of its proper divisors (71818708).

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

55633820 is a wasteful number, since it uses less digits than its factorization.

55633820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252901 (or 252899 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 55633820 is about 7458.8082157943. The cubic root of 55633820 is about 381.7505109578.

The spelling of 55633820 in words is "fifty-five million, six hundred thirty-three thousand, eight hundred twenty".