22781560 has 32 divisors (see below), whose sum is σ = 51775200. Its totient is φ = 9020800.

The previous prime is 22781543. The next prime is 22781567. The reversal of 22781560 is 6518722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22781567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1617975).

Almost surely, 2^22781560 is an apocalyptic number.

22781560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22781560 is an abundant number, since it is smaller than the sum of its proper divisors (28993640).

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

22781560 is a wasteful number, since it uses less digits than its factorization.

22781560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5751 (or 5747 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 22781560 is about 4773.0032474324. The cubic root of 22781560 is about 283.4835220659.

Subtracting from 22781560 its sum of digits (31), we obtain a square (22781529 = 4773²).

The spelling of 22781560 in words is "twenty-two million, seven hundred eighty-one thousand, five hundred sixty".