422240728 has 32 divisors (see below), whose sum is σ = 974403360. Its totient is φ = 167040000.

The previous prime is 422240699. The next prime is 422240759. The reversal of 422240728 is 827042224.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 422240728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289273 + ... + 290728.

It is an arithmetic number, because the mean of its divisors is an integer number (30450105).

Almost surely, 2^422240728 is an apocalyptic number.

It is an amenable number.

422240728 is an abundant number, since it is smaller than the sum of its proper divisors (552162632).

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

422240728 is a wasteful number, since it uses less digits than its factorization.

422240728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580027 (or 580023 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 422240728 is about 20548.4969766647. The cubic root of 422240728 is about 750.2166651060.

The spelling of 422240728 in words is "four hundred twenty-two million, two hundred forty thousand, seven hundred twenty-eight".