22478040 has 128 divisors (see below), whose sum is σ = 80740800. Its totient is φ = 5529600.

The previous prime is 22478039. The next prime is 22478047. The reversal of 22478040 is 4087422.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22477995 and 22478013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22478047) 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, 13240 + ... + 14840.

Almost surely, 2^22478040 is an apocalyptic number.

22478040 is a gapful number since it is divisible by the number (20) 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 22478040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40370400).

22478040 is an abundant number, since it is smaller than the sum of its proper divisors (58262760).

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

22478040 is a wasteful number, since it uses less digits than its factorization.

22478040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 22478040 is about 4741.1011379214. The cubic root of 22478040 is about 282.2189336514.

The spelling of 22478040 in words is "twenty-two million, four hundred seventy-eight thousand, forty".