28727272 has 32 divisors (see below), whose sum is σ = 62726400. Its totient is φ = 12078144.

The previous prime is 28727267. The next prime is 28727287. The reversal of 28727272 is 27272782.

It is a nude number because it is divisible by every one of its digits.

28727272 is a modest number, since divided by 7272 gives 2872 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1872 + ... + 7807.

It is an arithmetic number, because the mean of its divisors is an integer number (1960200).

Almost surely, 2^28727272 is an apocalyptic number.

It is an amenable number.

28727272 is an abundant number, since it is smaller than the sum of its proper divisors (33999128).

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

28727272 is a wasteful number, since it uses less digits than its factorization.

28727272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9745 (or 9741 counting only the distinct ones).

The product of its digits is 43904, while the sum is 37.

The square root of 28727272 is about 5359.7828314214. The cubic root of 28727272 is about 306.2655362381.

The spelling of 28727272 in words is "twenty-eight million, seven hundred twenty-seven thousand, two hundred seventy-two".