28724956 has 12 divisors (see below), whose sum is σ = 54135592. Its totient is φ = 13257648.

The previous prime is 28724947. The next prime is 28724957. The reversal of 28724956 is 65942782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276150 + ... + 276253.

Almost surely, 2^28724956 is an apocalyptic number.

28724956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28724956 is a deficient number, since it is larger than the sum of its proper divisors (25410636).

28724956 is a wasteful number, since it uses less digits than its factorization.

28724956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552420 (or 552418 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 28724956 is about 5359.5667735368. The cubic root of 28724956 is about 306.2573056150.

The spelling of 28724956 in words is "twenty-eight million, seven hundred twenty-four thousand, nine hundred fifty-six".