55720772 has 12 divisors (see below), whose sum is σ = 97589436. Its totient is φ = 27838080.

The previous prime is 55720757. The next prime is 55720783. The reversal of 55720772 is 27702755.

It can be written as a sum of positive squares in 2 ways, for example, as 20484676 + 35236096 = 4526^2 + 5936^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (8132453).

Almost surely, 2^55720772 is an apocalyptic number.

It is an amenable number.

55720772 is a deficient number, since it is larger than the sum of its proper divisors (41868664).

55720772 is a wasteful number, since it uses less digits than its factorization.

55720772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11158 (or 11156 counting only the distinct ones).

The product of its (nonzero) digits is 34300, while the sum is 35.

The square root of 55720772 is about 7464.6347532883. The cubic root of 55720772 is about 381.9492910769.

The spelling of 55720772 in words is "fifty-five million, seven hundred twenty thousand, seven hundred seventy-two".