55807558 has 12 divisors (see below), whose sum is σ = 85117500. Its totient is φ = 27442680.

The previous prime is 55807489. The next prime is 55807567. The reversal of 55807558 is 85570855.

55807558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55807558² = 6228967059846728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3693 + ... + 11191.

It is an arithmetic number, because the mean of its divisors is an integer number (7093125).

Almost surely, 2^55807558 is an apocalyptic number.

55807558 is a deficient number, since it is larger than the sum of its proper divisors (29309942).

55807558 is an equidigital number, since it uses as much as digits as its factorization.

55807558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623 (or 7562 counting only the distinct ones).

The product of its (nonzero) digits is 280000, while the sum is 43.

The square root of 55807558 is about 7470.4456359711. The cubic root of 55807558 is about 382.1474856067.

It can be divided in two parts, 55807 and 558, that added together give a palindrome (56365).

The spelling of 55807558 in words is "fifty-five million, eight hundred seven thousand, five hundred fifty-eight".