28772296 has 32 divisors (see below), whose sum is σ = 65283840. Its totient is φ = 11605248.

The previous prime is 28772257. The next prime is 28772299. The reversal of 28772296 is 69227782.

It is a happy number.

It is a super-2 number, since 2×28772296² = 1655690034223232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28772299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14160 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (2040120).

Almost surely, 2^28772296 is an apocalyptic number.

It is an amenable number.

28772296 is an abundant number, since it is smaller than the sum of its proper divisors (36511544).

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

28772296 is a wasteful number, since it uses less digits than its factorization.

28772296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30253 (or 30249 counting only the distinct ones).

The product of its digits is 169344, while the sum is 43.

The square root of 28772296 is about 5363.9813571637. The cubic root of 28772296 is about 306.4254551451.

The spelling of 28772296 in words is "twenty-eight million, seven hundred seventy-two thousand, two hundred ninety-six".