22691690 has 32 divisors (see below), whose sum is σ = 48190464. Its totient is φ = 7528320.

The previous prime is 22691687. The next prime is 22691699. The reversal of 22691690 is 9619622.

It is a super-2 number, since 2×22691690² = 1029825590112200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 22691690.

It is not an unprimeable number, because it can be changed into a prime (22691699) 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, 3059 + ... + 7398.

It is an arithmetic number, because the mean of its divisors is an integer number (1505952).

Almost surely, 2^22691690 is an apocalyptic number.

22691690 is an abundant number, since it is smaller than the sum of its proper divisors (25498774).

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

22691690 is a wasteful number, since it uses less digits than its factorization.

22691690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10502.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 22691690 is about 4763.5795364411. The cubic root of 22691690 is about 283.1102634839.

The spelling of 22691690 in words is "twenty-two million, six hundred ninety-one thousand, six hundred ninety".