55772479 has 4 divisors (see below), whose sum is σ = 63739984. Its totient is φ = 47804976.

The previous prime is 55772477. The next prime is 55772501. The reversal of 55772479 is 97427755.

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 55772479 - 2¹ = 55772477 is a prime.

It is a super-2 number, since 2×55772479² = 6221138827610882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55772477) 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, 3983742 + ... + 3983755.

It is an arithmetic number, because the mean of its divisors is an integer number (15934996).

Almost surely, 2^55772479 is an apocalyptic number.

55772479 is a deficient number, since it is larger than the sum of its proper divisors (7967505).

55772479 is an equidigital number, since it uses as much as digits as its factorization.

55772479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967504.

The product of its digits is 617400, while the sum is 46.

The square root of 55772479 is about 7468.0974150047. The cubic root of 55772479 is about 382.0673999107.

The spelling of 55772479 in words is "fifty-five million, seven hundred seventy-two thousand, four hundred seventy-nine".