55991706 has 32 divisors (see below), whose sum is σ = 117669888. Its totient is φ = 17727600.

The previous prime is 55991701. The next prime is 55991713. The reversal of 55991706 is 60719955.

It is a super-2 number, since 2×55991706² = 6270142281580872, which contains 22 as substring.

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, 19495 + ... + 22181.

It is an arithmetic number, because the mean of its divisors is an integer number (3677184).

Almost surely, 2^55991706 is an apocalyptic number.

55991706 is an abundant number, since it is smaller than the sum of its proper divisors (61678182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55991706 is a wasteful number, since it uses less digits than its factorization.

55991706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866.

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 55991706 is about 7482.7605868423. The cubic root of 55991706 is about 382.5673477038.

The spelling of 55991706 in words is "fifty-five million, nine hundred ninety-one thousand, seven hundred six".