55772997 has 32 divisors (see below), whose sum is σ = 87757824. Its totient is φ = 30844800.

The previous prime is 55772989. The next prime is 55773017. The reversal of 55772997 is 79927755.

It is not a de Polignac number, because 55772997 - 2³ = 55772989 is a prime.

It is a super-2 number, since 2×55772997² = 6221254388724018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55772897) 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, 181518 + ... + 181824.

It is an arithmetic number, because the mean of its divisors is an integer number (2742432).

Almost surely, 2^55772997 is an apocalyptic number.

It is an amenable number.

55772997 is a deficient number, since it is larger than the sum of its proper divisors (31984827).

55772997 is a wasteful number, since it uses less digits than its factorization.

55772997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its digits is 1389150, while the sum is 51.

The square root of 55772997 is about 7468.1320957787. The cubic root of 55772997 is about 382.0685827539.

The spelling of 55772997 in words is "fifty-five million, seven hundred seventy-two thousand, nine hundred ninety-seven".