22478508 has 72 divisors (see below), whose sum is σ = 62670608. Its totient is φ = 6749568.

The previous prime is 22478507. The next prime is 22478513. The reversal of 22478508 is 80587422.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (22478507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19566 + ... + 20682.

Almost surely, 2^22478508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22478508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31335304).

22478508 is an abundant number, since it is smaller than the sum of its proper divisors (40192100).

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

22478508 is a wasteful number, since it uses less digits than its factorization.

22478508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 22478508 is about 4741.1504932875. The cubic root of 22478508 is about 282.2208922674.

22478508 divided by its sum of digits (36) gives a triangular number (624403 = T₁₁₁₇).

The spelling of 22478508 in words is "twenty-two million, four hundred seventy-eight thousand, five hundred eight".