55623840 has 48 divisors (see below), whose sum is σ = 175216608. Its totient is φ = 14832896.

The previous prime is 55623823. The next prime is 55623851. The reversal of 55623840 is 4832655.

It is a tau number, because it is divible by the number of its divisors (48).

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, 57462 + ... + 58421.

It is an arithmetic number, because the mean of its divisors is an integer number (3650346).

Almost surely, 2^55623840 is an apocalyptic number.

It is an amenable number.

55623840 is an abundant number, since it is smaller than the sum of its proper divisors (119592768).

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

55623840 is a wasteful number, since it uses less digits than its factorization.

55623840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115901 (or 115893 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 55623840 is about 7458.1391781060. The cubic root of 55623840 is about 381.7276825299.

The spelling of 55623840 in words is "fifty-five million, six hundred twenty-three thousand, eight hundred forty".