55879720 has 64 divisors (see below), whose sum is σ = 138756240. Its totient is φ = 20121600.

The previous prime is 55879717. The next prime is 55879729. The reversal of 55879720 is 2797855.

It can be written as a sum of positive squares in 8 ways, for example, as 9012004 + 46867716 = 3002^2 + 6846^2 .

It is not an unprimeable number, because it can be changed into a prime (55879729) 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, 20010 + ... + 22630.

Almost surely, 2^55879720 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 55879720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69378120).

55879720 is an abundant number, since it is smaller than the sum of its proper divisors (82876520).

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

55879720 is a wasteful number, since it uses less digits than its factorization.

55879720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686 (or 2682 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 55879720 is about 7475.2739080250. The cubic root of 55879720 is about 382.3121266841.

The spelling of 55879720 in words is "fifty-five million, eight hundred seventy-nine thousand, seven hundred twenty".