390222028 has 24 divisors (see below), whose sum is σ = 807357600. Its totient is φ = 161470848.

The previous prime is 390222023. The next prime is 390222037. The reversal of 390222028 is 820222093.

It is a super-2 number, since 2×390222028² = 304546462272865568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 390221987 and 390222005.

It is not an unprimeable number, because it can be changed into a prime (390222023) 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, 239473 + ... + 241096.

It is an arithmetic number, because the mean of its divisors is an integer number (33639900).

Almost surely, 2^390222028 is an apocalyptic number.

It is an amenable number.

390222028 is an abundant number, since it is smaller than the sum of its proper divisors (417135572).

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

390222028 is a wasteful number, since it uses less digits than its factorization.

390222028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480609 (or 480607 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 390222028 is about 19754.0382706929. The cubic root of 390222028 is about 730.7529779796.

The spelling of 390222028 in words is "three hundred ninety million, two hundred twenty-two thousand, twenty-eight".