55405080 has 192 divisors, whose sum is σ = 194407200. Its totient is φ = 14031360.

The previous prime is 55405079. The next prime is 55405093. The reversal of 55405080 is 8050455.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 908250 + ... + 908310.

Almost surely, 2^55405080 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 55405080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97203600).

55405080 is an abundant number, since it is smaller than the sum of its proper divisors (139002120).

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

55405080 is a wasteful number, since it uses less digits than its factorization.

55405080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 55405080 is about 7443.4588734002. The cubic root of 55405080 is about 381.2265996567.

The spelling of 55405080 in words is "fifty-five million, four hundred five thousand, eighty".