55991722 has 8 divisors (see below), whose sum is σ = 84217536. Its totient is φ = 27919212.

The previous prime is 55991713. The next prime is 55991723. The reversal of 55991722 is 22719955.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (55991723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37408 + ... + 38875.

It is an arithmetic number, because the mean of its divisors is an integer number (10527192).

Almost surely, 2^55991722 is an apocalyptic number.

55991722 is a deficient number, since it is larger than the sum of its proper divisors (28225814).

55991722 is a wasteful number, since it uses less digits than its factorization.

55991722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76652.

The product of its digits is 56700, while the sum is 40.

The square root of 55991722 is about 7482.7616559663. The cubic root of 55991722 is about 382.5673841442.

The spelling of 55991722 in words is "fifty-five million, nine hundred ninety-one thousand, seven hundred twenty-two".