55771772 has 12 divisors (see below), whose sum is σ = 111543600. Its totient is φ = 23902176.

The previous prime is 55771753. The next prime is 55771801. The reversal of 55771772 is 27717755.

55771772 is an admirable number.

It is a super-2 number, since 2×55771772² = 6220981104039968, which contains 22 as substring.

It is a congruent number.

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, 995897 + ... + 995952.

It is an arithmetic number, because the mean of its divisors is an integer number (9295300).

Almost surely, 2^55771772 is an apocalyptic number.

It is an amenable number.

55771772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55771772 is a wasteful number, since it uses less digits than its factorization.

55771772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991860 (or 1991858 counting only the distinct ones).

The product of its digits is 120050, while the sum is 41.

The square root of 55771772 is about 7468.0500801749. The cubic root of 55771772 is about 382.0657854777.

The spelling of 55771772 in words is "fifty-five million, seven hundred seventy-one thousand, seven hundred seventy-two".