22651990 has 32 divisors (see below), whose sum is σ = 45450720. Its totient is φ = 8077824.

The previous prime is 22651957. The next prime is 22651999. The reversal of 22651990 is 9915622.

It is a super-2 number, since 2×22651990² = 1026225301920200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22651999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277 + ... + 6736.

It is an arithmetic number, because the mean of its divisors is an integer number (1420335).

Almost surely, 2^22651990 is an apocalyptic number.

22651990 is an abundant number, since it is smaller than the sum of its proper divisors (22798730).

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

22651990 is a wasteful number, since it uses less digits than its factorization.

22651990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 22651990 is about 4759.4106778046. The cubic root of 22651990 is about 282.9450629417.

The spelling of 22651990 in words is "twenty-two million, six hundred fifty-one thousand, nine hundred ninety".