22997790 has 64 divisors (see below), whose sum is σ = 64569600. Its totient is φ = 5808672.

The previous prime is 22997789. The next prime is 22997791. The reversal of 22997790 is 9779922.

It is an interprime number because it is at equal distance from previous prime (22997789) and next prime (22997791).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22997791) 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, 2889 + ... + 7371.

It is an arithmetic number, because the mean of its divisors is an integer number (1008900).

Almost surely, 2^22997790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22997790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32284800).

22997790 is an abundant number, since it is smaller than the sum of its proper divisors (41571810).

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

22997790 is a wasteful number, since it uses less digits than its factorization.

22997790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518 (or 4512 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 22997790 is about 4795.6011093501. The cubic root of 22997790 is about 284.3775890760.

The spelling of 22997790 in words is "twenty-two million, nine hundred ninety-seven thousand, seven hundred ninety".