22278460 has 24 divisors (see below), whose sum is σ = 48295296. Its totient is φ = 8623680.

The previous prime is 22278439. The next prime is 22278493. The reversal of 22278460 is 6487222.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17347 + ... + 18586.

It is an arithmetic number, because the mean of its divisors is an integer number (2012304).

Almost surely, 2^22278460 is an apocalyptic number.

22278460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22278460 is an abundant number, since it is smaller than the sum of its proper divisors (26016836).

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

22278460 is a wasteful number, since it uses less digits than its factorization.

22278460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35973 (or 35971 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 22278460 is about 4720.0063559279. The cubic root of 22278460 is about 281.3811858785.

The spelling of 22278460 in words is "twenty-two million, two hundred seventy-eight thousand, four hundred sixty".