28622736 has 30 divisors (see below), whose sum is σ = 80104310. Its totient is φ = 9540864.

The previous prime is 28622731. The next prime is 28622743. The reversal of 28622736 is 63722682.

28622736 is a `hidden beast` number, since 28 + 622 + 7 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 9960336 = 4320^2 + 3156^2 .

It is a super-2 number, since 2×28622736² = 1638522032251392, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28622736.

It is not an unprimeable number, because it can be changed into a prime (28622731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99241 + ... + 99528.

Almost surely, 2^28622736 is an apocalyptic number.

It is an amenable number.

28622736 is an abundant number, since it is smaller than the sum of its proper divisors (51481574).

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

28622736 is a wasteful number, since it uses less digits than its factorization.

28622736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198783 (or 198774 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28622736 is about 5350.0220560293. The cubic root of 28622736 is about 305.8935936582.

The spelling of 28622736 in words is "twenty-eight million, six hundred twenty-two thousand, seven hundred thirty-six".