28990656 has 112 divisors (see below), whose sum is σ = 89814400. Its totient is φ = 9144576.

The previous prime is 28990651. The next prime is 28990657. The reversal of 28990656 is 65609982.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (28990651) 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, 32391 + ... + 33273.

Almost surely, 2^28990656 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 28990656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44907200).

28990656 is an abundant number, since it is smaller than the sum of its proper divisors (60823744).

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

28990656 is a wasteful number, since it uses less digits than its factorization.

28990656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 28990656 is about 5384.2971686191. The cubic root of 28990656 is about 307.1986816350.

It can be divided in two parts, 28990 and 656, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 28990656 in words is "twenty-eight million, nine hundred ninety thousand, six hundred fifty-six".