22890815 has 4 divisors (see below), whose sum is σ = 27468984. Its totient is φ = 18312648.

The previous prime is 22890793. The next prime is 22890817. The reversal of 22890815 is 51809822.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22890815 - 2¹² = 22886719 is a prime.

It is a super-2 number, since 2×22890815² = 1047978822728450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22890817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2289077 + ... + 2289086.

It is an arithmetic number, because the mean of its divisors is an integer number (6867246).

Almost surely, 2^22890815 is an apocalyptic number.

22890815 is a deficient number, since it is larger than the sum of its proper divisors (4578169).

22890815 is an equidigital number, since it uses as much as digits as its factorization.

22890815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578168.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 22890815 is about 4784.4346583478. The cubic root of 22890815 is about 283.9359729697.

The spelling of 22890815 in words is "twenty-two million, eight hundred ninety thousand, eight hundred fifteen".