28932390 has 80 divisors (see below), whose sum is σ = 81230688. Its totient is φ = 7375104.

The previous prime is 28932377. The next prime is 28932403. The reversal of 28932390 is 9323982.

It is an interprime number because it is at equal distance from previous prime (28932377) and next prime (28932403).

It is a super-2 number, since 2×28932390² = 1674166382224200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17854 + ... + 19406.

Almost surely, 2^28932390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28932390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40615344).

28932390 is an abundant number, since it is smaller than the sum of its proper divisors (52298298).

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

28932390 is a wasteful number, since it uses less digits than its factorization.

28932390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 28932390 is about 5378.8837131881. The cubic root of 28932390 is about 306.9927389201.

The spelling of 28932390 in words is "twenty-eight million, nine hundred thirty-two thousand, three hundred ninety".