220191428 has 12 divisors (see below), whose sum is σ = 393533952. Its totient is φ = 107753160.

The previous prime is 220191427. The next prime is 220191449. The reversal of 220191428 is 824191022.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 220191428.

It is not an unprimeable number, because it can be changed into a prime (220191427) 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, 585428 + ... + 585803.

It is an arithmetic number, because the mean of its divisors is an integer number (32794496).

Almost surely, 2^220191428 is an apocalyptic number.

It is an amenable number.

220191428 is a deficient number, since it is larger than the sum of its proper divisors (173342524).

220191428 is a wasteful number, since it uses less digits than its factorization.

220191428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171282 (or 1171280 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 220191428 is about 14838.8486076245. The cubic root of 220191428 is about 603.8561160419.

The spelling of 220191428 in words is "two hundred twenty million, one hundred ninety-one thousand, four hundred twenty-eight".