55549980 has 72 divisors (see below), whose sum is σ = 172444272. Its totient is φ = 14466816.

The previous prime is 55549979. The next prime is 55550017. The reversal of 55549980 is 8994555.

55549980 is a `hidden beast` number, since 5 + 554 + 9 + 98 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 4152 + ... + 11328.

Almost surely, 2^55549980 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 55549980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86222136).

55549980 is an abundant number, since it is smaller than the sum of its proper divisors (116894292).

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

55549980 is a wasteful number, since it uses less digits than its factorization.

55549980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235 (or 7230 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 55549980 is about 7453.1858959776. The cubic root of 55549980 is about 381.5586489217.

The spelling of 55549980 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred eighty".