28491272 has 16 divisors (see below), whose sum is σ = 53490240. Its totient is φ = 14227216.

The previous prime is 28491233. The next prime is 28491283. The reversal of 28491272 is 27219482.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6053 + ... + 9675.

It is an arithmetic number, because the mean of its divisors is an integer number (3343140).

Almost surely, 2^28491272 is an apocalyptic number.

It is an amenable number.

28491272 is a deficient number, since it is larger than the sum of its proper divisors (24998968).

28491272 is a wasteful number, since it uses less digits than its factorization.

28491272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612 (or 4608 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 28491272 is about 5337.7216113244. The cubic root of 28491272 is about 305.4245525376.

The spelling of 28491272 in words is "twenty-eight million, four hundred ninety-one thousand, two hundred seventy-two".