28839756 has 48 divisors (see below), whose sum is σ = 75132288. Its totient is φ = 8534400.

The previous prime is 28839737. The next prime is 28839757. The reversal of 28839756 is 65793882.

It is a super-2 number, since 2×28839756² = 1663463052279072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28839757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3136 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (1565256).

Almost surely, 2^28839756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28839756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37566144).

28839756 is an abundant number, since it is smaller than the sum of its proper divisors (46292532).

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

28839756 is a wasteful number, since it uses less digits than its factorization.

28839756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142 (or 5140 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 28839756 is about 5370.2659152038. The cubic root of 28839756 is about 306.6647516159.

The spelling of 28839756 in words is "twenty-eight million, eight hundred thirty-nine thousand, seven hundred fifty-six".