55774309 has 4 divisors (see below), whose sum is σ = 57134700. Its totient is φ = 54413920.

The previous prime is 55774283. The next prime is 55774339. The reversal of 55774309 is 90347755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9941409 + 45832900 = 3153^2 + 6770^2 .

It is a cyclic number.

It is not a de Polignac number, because 55774309 - 2⁷ = 55774181 is a prime.

It is a super-2 number, since 2×55774309² = 6221547088854962, 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 (55774339) 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, 680134 + ... + 680215.

It is an arithmetic number, because the mean of its divisors is an integer number (14283675).

Almost surely, 2^55774309 is an apocalyptic number.

It is an amenable number.

55774309 is a deficient number, since it is larger than the sum of its proper divisors (1360391).

55774309 is a wasteful number, since it uses less digits than its factorization.

55774309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360390.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 55774309 is about 7468.2199351653. The cubic root of 55774309 is about 382.0715786485.

The spelling of 55774309 in words is "fifty-five million, seven hundred seventy-four thousand, three hundred nine".