55991705 has 16 divisors (see below), whose sum is σ = 83769984. Its totient is φ = 34903680.

The previous prime is 55991701. The next prime is 55991713. The reversal of 55991705 is 50719955.

It is not a de Polignac number, because 55991705 - 2² = 55991701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55991701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72332 + ... + 73101.

It is an arithmetic number, because the mean of its divisors is an integer number (5235624).

Almost surely, 2^55991705 is an apocalyptic number.

55991705 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55991705 is a deficient number, since it is larger than the sum of its proper divisors (27778279).

55991705 is a wasteful number, since it uses less digits than its factorization.

55991705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145456.

The product of its (nonzero) digits is 70875, while the sum is 41.

The square root of 55991705 is about 7482.7605200220. The cubic root of 55991705 is about 382.5673454263.

The spelling of 55991705 in words is "fifty-five million, nine hundred ninety-one thousand, seven hundred five".