28274436 has 36 divisors (see below), whose sum is σ = 71914752. Its totient is φ = 9366384.

The previous prime is 28274431. The next prime is 28274437. The reversal of 28274436 is 63447282.

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

It is a super-2 number, since 2×28274436² = 1598887462236192, 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 28274436.

It is not an unprimeable number, because it can be changed into a prime (28274431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3661 + ... + 8363.

It is an arithmetic number, because the mean of its divisors is an integer number (1997632).

Almost surely, 2^28274436 is an apocalyptic number.

It is an amenable number.

28274436 is an abundant number, since it is smaller than the sum of its proper divisors (43640316).

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

28274436 is a wasteful number, since it uses less digits than its factorization.

28274436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4880 (or 4875 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 28274436 is about 5317.3711549976. The cubic root of 28274436 is about 304.6477560309.

The spelling of 28274436 in words is "twenty-eight million, two hundred seventy-four thousand, four hundred thirty-six".