55787807 has 4 divisors (see below), whose sum is σ = 55805616. Its totient is φ = 55770000.

The previous prime is 55787803. The next prime is 55787821. The reversal of 55787807 is 70878755.

55787807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55787807 - 2² = 55787803 is a prime.

It is a super-2 number, since 2×55787807² = 6224558819738498, 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 (55787803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2819 + ... + 10932.

It is an arithmetic number, because the mean of its divisors is an integer number (13951404).

Almost surely, 2^55787807 is an apocalyptic number.

55787807 is a deficient number, since it is larger than the sum of its proper divisors (17809).

55787807 is a wasteful number, since it uses less digits than its factorization.

55787807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808.

The product of its (nonzero) digits is 548800, while the sum is 47.

The square root of 55787807 is about 7469.1235764312. The cubic root of 55787807 is about 382.1023980125.

The spelling of 55787807 in words is "fifty-five million, seven hundred eighty-seven thousand, eight hundred seven".