55990480 has 80 divisors (see below), whose sum is σ = 160239744. Its totient is φ = 17717760.

The previous prime is 55990471. The next prime is 55990481. The reversal of 55990480 is 8409955.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55990481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3435 + ... + 11125.

Almost surely, 2^55990480 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 55990480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80119872).

55990480 is an abundant number, since it is smaller than the sum of its proper divisors (104249264).

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

55990480 is a wasteful number, since it uses less digits than its factorization.

55990480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7724 (or 7718 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 55990480 is about 7482.6786647564. The cubic root of 55990480 is about 382.5645554391.

The spelling of 55990480 in words is "fifty-five million, nine hundred ninety thousand, four hundred eighty".