22487890 has 16 divisors (see below), whose sum is σ = 40799232. Its totient is φ = 8923824.

The previous prime is 22487879. The next prime is 22487891. The reversal of 22487890 is 9878422.

22487890 = T₁₃₅ + T₁₃₆ + ... + T₅₁₅.

It is not an unprimeable number, because it can be changed into a prime (22487891) 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, 7584 + ... + 10123.

It is an arithmetic number, because the mean of its divisors is an integer number (2549952).

Almost surely, 2^22487890 is an apocalyptic number.

22487890 is a deficient number, since it is larger than the sum of its proper divisors (18311342).

22487890 is a wasteful number, since it uses less digits than its factorization.

22487890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17841.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 22487890 is about 4742.1398123632. The cubic root of 22487890 is about 282.2601509246.

The spelling of 22487890 in words is "twenty-two million, four hundred eighty-seven thousand, eight hundred ninety".