22742780 has 12 divisors (see below), whose sum is σ = 47759880. Its totient is φ = 9097104.

The previous prime is 22742761. The next prime is 22742801. The reversal of 22742780 is 8724722.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568550 + ... + 568589.

It is an arithmetic number, because the mean of its divisors is an integer number (3979990).

Almost surely, 2^22742780 is an apocalyptic number.

22742780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22742780 is an abundant number, since it is smaller than the sum of its proper divisors (25017100).

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

22742780 is a wasteful number, since it uses less digits than its factorization.

22742780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137148 (or 1137146 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 22742780 is about 4768.9390853732. The cubic root of 22742780 is about 283.3225770619.

The spelling of 22742780 in words is "twenty-two million, seven hundred forty-two thousand, seven hundred eighty".