55220718 has 16 divisors (see below), whose sum is σ = 126218880. Its totient is φ = 15777336.

The previous prime is 55220713. The next prime is 55220731. The reversal of 55220718 is 81702255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55220713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657348 + ... + 657431.

It is an arithmetic number, because the mean of its divisors is an integer number (7888680).

Almost surely, 2^55220718 is an apocalyptic number.

55220718 is an abundant number, since it is smaller than the sum of its proper divisors (70998162).

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

55220718 is a wasteful number, since it uses less digits than its factorization.

55220718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314791.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 55220718 is about 7431.0643921312. The cubic root of 55220718 is about 380.8032822773.

The spelling of 55220718 in words is "fifty-five million, two hundred twenty thousand, seven hundred eighteen".