55722890 has 32 divisors (see below), whose sum is σ = 102743424. Its totient is φ = 21752640.

The previous prime is 55722869. The next prime is 55722929. The reversal of 55722890 is 9822755.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101597 + ... + 102143.

It is an arithmetic number, because the mean of its divisors is an integer number (3210732).

Almost surely, 2^55722890 is an apocalyptic number.

55722890 is a deficient number, since it is larger than the sum of its proper divisors (47020534).

55722890 is a wasteful number, since it uses less digits than its factorization.

55722890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 55722890 is about 7464.7766209043. The cubic root of 55722890 is about 381.9541304352.

The spelling of 55722890 in words is "fifty-five million, seven hundred twenty-two thousand, eight hundred ninety".