55805907 has 18 divisors (see below), whose sum is σ = 78877668. Its totient is φ = 35090568.

The previous prime is 55805903. The next prime is 55805941. The reversal of 55805907 is 70950855.

It is not a de Polignac number, because 55805907 - 2² = 55805903 is a prime.

It is a super-2 number, since 2×55805907² = 6228598512185298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55805903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 245728 + ... + 245954.

Almost surely, 2^55805907 is an apocalyptic number.

55805907 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

55805907 is a deficient number, since it is larger than the sum of its proper divisors (23071761).

55805907 is an equidigital number, since it uses as much as digits as its factorization.

55805907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The square root of 55805907 is about 7470.3351330446. The cubic root of 55805907 is about 382.1437171104.

The spelling of 55805907 in words is "fifty-five million, eight hundred five thousand, nine hundred seven".