28739256 has 64 divisors (see below), whose sum is σ = 88435200. Its totient is φ = 7579008.

The previous prime is 28739239. The next prime is 28739273. The reversal of 28739256 is 65293782.

It is an interprime number because it is at equal distance from previous prime (28739239) and next prime (28739273).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4396 + ... + 8763.

It is an arithmetic number, because the mean of its divisors is an integer number (1381800).

Almost surely, 2^28739256 is an apocalyptic number.

28739256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28739256 is an abundant number, since it is smaller than the sum of its proper divisors (59695944).

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

28739256 is a wasteful number, since it uses less digits than its factorization.

28739256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13188 (or 13184 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 28739256 is about 5360.9006705963. The cubic root of 28739256 is about 306.3081180274.

The spelling of 28739256 in words is "twenty-eight million, seven hundred thirty-nine thousand, two hundred fifty-six".