22287780 has 36 divisors (see below), whose sum is σ = 67606812. Its totient is φ = 5943360.

The previous prime is 22287767. The next prime is 22287821. The reversal of 22287780 is 8778222.

It can be written as a sum of positive squares in 2 ways, for example, as 4848804 + 17438976 = 2202^2 + 4176^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61731 + ... + 62090.

It is an arithmetic number, because the mean of its divisors is an integer number (1877967).

Almost surely, 2^22287780 is an apocalyptic number.

22287780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22287780 is an abundant number, since it is smaller than the sum of its proper divisors (45319032).

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

22287780 is a wasteful number, since it uses less digits than its factorization.

22287780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123836 (or 123831 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 22287780 is about 4720.9935394999. The cubic root of 22287780 is about 281.4204181989.

The spelling of 22287780 in words is "twenty-two million, two hundred eighty-seven thousand, seven hundred eighty".