55880478 has 72 divisors (see below), whose sum is σ = 131116752. Its totient is φ = 17164224.

The previous prime is 55880459. The next prime is 55880543. The reversal of 55880478 is 87408855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 765450 + ... + 765522.

It is an arithmetic number, because the mean of its divisors is an integer number (1821066).

Almost surely, 2^55880478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55880478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65558376).

55880478 is an abundant number, since it is smaller than the sum of its proper divisors (75236274).

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

55880478 is a wasteful number, since it uses less digits than its factorization.

55880478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 55880478 is about 7475.3246083364. The cubic root of 55880478 is about 382.3138553451.

The spelling of 55880478 in words is "fifty-five million, eight hundred eighty thousand, four hundred seventy-eight".