22478540 has 48 divisors (see below), whose sum is σ = 54227712. Its totient is φ = 7667136.

The previous prime is 22478527. The next prime is 22478543. The reversal of 22478540 is 4587422.

It is a junction number, because it is equal to n+sod(n) for n = 22478497 and 22478506.

It is not an unprimeable number, because it can be changed into a prime (22478543) 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, 42719 + ... + 43241.

It is an arithmetic number, because the mean of its divisors is an integer number (1129744).

Almost surely, 2^22478540 is an apocalyptic number.

22478540 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 22478540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27113856).

22478540 is an abundant number, since it is smaller than the sum of its proper divisors (31749172).

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

22478540 is a wasteful number, since it uses less digits than its factorization.

22478540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 22478540 is about 4741.1538679946. The cubic root of 22478540 is about 282.2210261888.

The spelling of 22478540 in words is "twenty-two million, four hundred seventy-eight thousand, five hundred forty".