55990770 has 64 divisors (see below), whose sum is σ = 147308544. Its totient is φ = 13507520.

The previous prime is 55990751. The next prime is 55990787. The reversal of 55990770 is 7709955.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126169 + ... + 126611.

It is an arithmetic number, because the mean of its divisors is an integer number (2301696).

Almost surely, 2^55990770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55990770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73654272).

55990770 is an abundant number, since it is smaller than the sum of its proper divisors (91317774).

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

55990770 is a wasteful number, since it uses less digits than its factorization.

55990770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847.

The product of its (nonzero) digits is 99225, while the sum is 42.

The square root of 55990770 is about 7482.6980428185. The cubic root of 55990770 is about 382.5652159295.

The spelling of 55990770 in words is "fifty-five million, nine hundred ninety thousand, seven hundred seventy".