55772757 has 6 divisors (see below), whose sum is σ = 80560662. Its totient is φ = 37181832.

The previous prime is 55772747. The next prime is 55772779. The reversal of 55772757 is 75727755.

55772757 is a `hidden beast` number, since 5 + 577 + 2 + 75 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55487601 + 285156 = 7449^2 + 534^2 .

It is not a de Polignac number, because 55772757 - 2⁸ = 55772501 is a prime.

It is a super-2 number, since 2×55772757² = 6221200846762098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55772747) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3098478 + ... + 3098495.

It is an arithmetic number, because the mean of its divisors is an integer number (13426777).

Almost surely, 2^55772757 is an apocalyptic number.

It is an amenable number.

55772757 is a deficient number, since it is larger than the sum of its proper divisors (24787905).

55772757 is a wasteful number, since it uses less digits than its factorization.

55772757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6196979 (or 6196976 counting only the distinct ones).

The product of its digits is 600250, while the sum is 45.

The square root of 55772757 is about 7468.1160274865. The cubic root of 55772757 is about 382.0680347194.

The spelling of 55772757 in words is "fifty-five million, seven hundred seventy-two thousand, seven hundred fifty-seven".