28724752 has 20 divisors (see below), whose sum is σ = 63605056. Its totient is φ = 12310560.

The previous prime is 28724749. The next prime is 28724753. The reversal of 28724752 is 25742782.

It is a super-2 number, since 2×28724752² = 1650222754923008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28724753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128124 + ... + 128347.

Almost surely, 2^28724752 is an apocalyptic number.

It is an amenable number.

28724752 is an abundant number, since it is smaller than the sum of its proper divisors (34880304).

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

28724752 is a wasteful number, since it uses less digits than its factorization.

28724752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256486 (or 256480 counting only the distinct ones).

The product of its digits is 62720, while the sum is 37.

The square root of 28724752 is about 5359.5477421141. The cubic root of 28724752 is about 306.2565806166.

The spelling of 28724752 in words is "twenty-eight million, seven hundred twenty-four thousand, seven hundred fifty-two".