55777287 has 4 divisors (see below), whose sum is σ = 74369720. Its totient is φ = 37184856.

The previous prime is 55777283. The next prime is 55777313. The reversal of 55777287 is 78277755.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55777287 - 2² = 55777283 is a prime.

It is a super-2 number, since 2×55777287² = 6222211490160738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55777283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9296212 + ... + 9296217.

It is an arithmetic number, because the mean of its divisors is an integer number (18592430).

Almost surely, 2^55777287 is an apocalyptic number.

55777287 is a deficient number, since it is larger than the sum of its proper divisors (18592433).

55777287 is a wasteful number, since it uses less digits than its factorization.

55777287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18592432.

The product of its digits is 960400, while the sum is 48.

The square root of 55777287 is about 7468.4193106708. The cubic root of 55777287 is about 382.0783786067.

The spelling of 55777287 in words is "fifty-five million, seven hundred seventy-seven thousand, two hundred eighty-seven".