22747280 has 20 divisors (see below), whose sum is σ = 52887612. Its totient is φ = 9098880.

The previous prime is 22747279. The next prime is 22747289. The reversal of 22747280 is 8274722.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7661824 + 15085456 = 2768^2 + 3884^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (22747289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142091 + ... + 142250.

Almost surely, 2^22747280 is an apocalyptic number.

22747280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22747280 is an abundant number, since it is smaller than the sum of its proper divisors (30140332).

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

22747280 is a wasteful number, since it uses less digits than its factorization.

22747280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284354 (or 284348 counting only the distinct ones).

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

The square root of 22747280 is about 4769.4108650860. The cubic root of 22747280 is about 283.3412623694.

The spelling of 22747280 in words is "twenty-two million, seven hundred forty-seven thousand, two hundred eighty".