55621580 has 24 divisors (see below), whose sum is σ = 133492128. Its totient is φ = 19070208.

The previous prime is 55621561. The next prime is 55621627. The reversal of 55621580 is 8512655.

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, 198509 + ... + 198788.

It is an arithmetic number, because the mean of its divisors is an integer number (5562172).

Almost surely, 2^55621580 is an apocalyptic number.

It is an amenable number.

55621580 is an abundant number, since it is smaller than the sum of its proper divisors (77870548).

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

55621580 is a wasteful number, since it uses less digits than its factorization.

55621580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397313 (or 397311 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 55621580 is about 7457.9876642429. The cubic root of 55621580 is about 381.7225125869.

The spelling of 55621580 in words is "fifty-five million, six hundred twenty-one thousand, five hundred eighty".