22639890 has 64 divisors (see below), whose sum is σ = 66882816. Its totient is φ = 4776192.

The previous prime is 22639879. The next prime is 22639891. The reversal of 22639890 is 9893622.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (22639891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1417 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (1045044).

Almost surely, 2^22639890 is an apocalyptic number.

22639890 is an abundant number, since it is smaller than the sum of its proper divisors (44242926).

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

22639890 is a wasteful number, since it uses less digits than its factorization.

22639890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8323.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 22639890 is about 4758.1393422219. The cubic root of 22639890 is about 282.8946737700.

The spelling of 22639890 in words is "twenty-two million, six hundred thirty-nine thousand, eight hundred ninety".