55801580 has 48 divisors (see below), whose sum is σ = 121492224. Its totient is φ = 21515520.

The previous prime is 55801579. The next prime is 55801619. The reversal of 55801580 is 8510855.

55801580 = T₃₅₉ + T₃₆₀ + ... + T₇₂₄.

It is a super-2 number, since 2×55801580² = 6227632660992800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64229 + ... + 65091.

It is an arithmetic number, because the mean of its divisors is an integer number (2531088).

Almost surely, 2^55801580 is an apocalyptic number.

It is an amenable number.

55801580 is an abundant number, since it is smaller than the sum of its proper divisors (65690644).

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

55801580 is a wasteful number, since it uses less digits than its factorization.

55801580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 32.

The square root of 55801580 is about 7470.0455152562. The cubic root of 55801580 is about 382.1338401476.

The spelling of 55801580 in words is "fifty-five million, eight hundred one thousand, five hundred eighty".