55787307 has 4 divisors (see below), whose sum is σ = 74383080. Its totient is φ = 37191536.

The previous prime is 55787279. The next prime is 55787357. The reversal of 55787307 is 70378755.

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 55787307 - 2⁶ = 55787243 is a prime.

It is a super-2 number, since 2×55787307² = 6224447244624498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55787357) 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, 9297882 + ... + 9297887.

It is an arithmetic number, because the mean of its divisors is an integer number (18595770).

Almost surely, 2^55787307 is an apocalyptic number.

55787307 is a deficient number, since it is larger than the sum of its proper divisors (18595773).

55787307 is a wasteful number, since it uses less digits than its factorization.

55787307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18595772.

The product of its (nonzero) digits is 205800, while the sum is 42.

The square root of 55787307 is about 7469.0901052270. The cubic root of 55787307 is about 382.1012564741.

The spelling of 55787307 in words is "fifty-five million, seven hundred eighty-seven thousand, three hundred seven".