55297779 has 4 divisors (see below), whose sum is σ = 73730376. Its totient is φ = 36865184.

The previous prime is 55297777. The next prime is 55297783. The reversal of 55297779 is 97779255.

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

It is a cyclic number.

It is not a de Polignac number, because 55297779 - 2¹ = 55297777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55297777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9216294 + ... + 9216299.

It is an arithmetic number, because the mean of its divisors is an integer number (18432594).

Almost surely, 2^55297779 is an apocalyptic number.

55297779 is a deficient number, since it is larger than the sum of its proper divisors (18432597).

55297779 is a wasteful number, since it uses less digits than its factorization.

55297779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18432596.

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

The square root of 55297779 is about 7436.2476424605. The cubic root of 55297779 is about 380.9803380571.

The spelling of 55297779 in words is "fifty-five million, two hundred ninety-seven thousand, seven hundred seventy-nine".