55220994 has 16 divisors (see below), whose sum is σ = 122713440. Its totient is φ = 18406980.

The previous prime is 55220993. The next prime is 55221007. The reversal of 55220994 is 49902255.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55220993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 511252 + ... + 511359.

It is an arithmetic number, because the mean of its divisors is an integer number (7669590).

Almost surely, 2^55220994 is an apocalyptic number.

55220994 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

55220994 is an abundant number, since it is smaller than the sum of its proper divisors (67492446).

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

55220994 is a wasteful number, since it uses less digits than its factorization.

55220994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022622 (or 1022616 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 55220994 is about 7431.0829627989. The cubic root of 55220994 is about 380.8039167102.

The spelling of 55220994 in words is "fifty-five million, two hundred twenty thousand, nine hundred ninety-four".