28744422 has 32 divisors (see below), whose sum is σ = 65981952. Its totient is φ = 8177664.

The previous prime is 28744393. The next prime is 28744427. The reversal of 28744422 is 22444782.

It is a super-2 number, since 2×28744422² = 1652483592228168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9463 + ... + 12125.

It is an arithmetic number, because the mean of its divisors is an integer number (2061936).

Almost surely, 2^28744422 is an apocalyptic number.

28744422 is an abundant number, since it is smaller than the sum of its proper divisors (37237530).

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

28744422 is a wasteful number, since it uses less digits than its factorization.

28744422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 28672, while the sum is 33.

The square root of 28744422 is about 5361.3824709677. The cubic root of 28744422 is about 306.3264703110.

The spelling of 28744422 in words is "twenty-eight million, seven hundred forty-four thousand, four hundred twenty-two".