22918464 has 70 divisors (see below), whose sum is σ = 67952874. Its totient is φ = 7637760.

The previous prime is 22918463. The next prime is 22918477. The reversal of 22918464 is 46481922.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 1016064 = 4680^2 + 1008^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22918463) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2974 + ... + 7394.

Almost surely, 2^22918464 is an apocalyptic number.

22918464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22918464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33976437).

22918464 is an abundant number, since it is smaller than the sum of its proper divisors (45034410).

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

22918464 is an equidigital number, since it uses as much as digits as its factorization.

22918464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4445 (or 4426 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 22918464 is about 4787.3232604452. The cubic root of 22918464 is about 284.0502456891.

The spelling of 22918464 in words is "twenty-two million, nine hundred eighteen thousand, four hundred sixty-four".