28792890 has 72 divisors (see below), whose sum is σ = 87097140. Its totient is φ = 6580224.

The previous prime is 28792889. The next prime is 28792891. The reversal of 28792890 is 9829782.

It is an interprime number because it is at equal distance from previous prime (28792889) and next prime (28792891).

It can be written as a sum of positive squares in 2 ways, for example, as 26040609 + 2752281 = 5103^2 + 1659^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28792891) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1146 + ... + 7674.

Almost surely, 2^28792890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28792890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43548570).

28792890 is an abundant number, since it is smaller than the sum of its proper divisors (58304250).

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

28792890 is a wasteful number, since it uses less digits than its factorization.

28792890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556 (or 6546 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 28792890 is about 5365.9006699714. The cubic root of 28792890 is about 306.4985465292.

The spelling of 28792890 in words is "twenty-eight million, seven hundred ninety-two thousand, eight hundred ninety".