28890756 has 36 divisors (see below), whose sum is σ = 75736752. Its totient is φ = 9629928.

The previous prime is 28890751. The next prime is 28890761. The reversal of 28890756 is 65709882.

It is an interprime number because it is at equal distance from previous prime (28890751) and next prime (28890761).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (28890751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13890 + ... + 15833.

Almost surely, 2^28890756 is an apocalyptic number.

It is an amenable number.

28890756 is an abundant number, since it is smaller than the sum of its proper divisors (46845996).

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

28890756 is a wasteful number, since it uses less digits than its factorization.

28890756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29742 (or 29728 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28890756 is about 5375.0121860327. The cubic root of 28890756 is about 306.8454130174.

It can be divided in two parts, 28890 and 756, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 28890756 in words is "twenty-eight million, eight hundred ninety thousand, seven hundred fifty-six".