55996780 has 96 divisors (see below), whose sum is σ = 139991040. Its totient is φ = 18420480.

The previous prime is 55996771. The next prime is 55996783. The reversal of 55996780 is 8769955.

It is not an unprimeable number, because it can be changed into a prime (55996783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 674619 + ... + 674701.

It is an arithmetic number, because the mean of its divisors is an integer number (1458240).

Almost surely, 2^55996780 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 55996780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69995520).

55996780 is an abundant number, since it is smaller than the sum of its proper divisors (83994260).

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

55996780 is a wasteful number, since it uses less digits than its factorization.

55996780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 55996780 is about 7483.0996251553. The cubic root of 55996780 is about 382.5789035111.

The spelling of 55996780 in words is "fifty-five million, nine hundred ninety-six thousand, seven hundred eighty".