28390332 has 48 divisors (see below), whose sum is σ = 70156800. Its totient is φ = 8910720.

The previous prime is 28390321. The next prime is 28390337. The reversal of 28390332 is 23309382.

It is a self number, because there is not a number n which added to its sum of digits gives 28390332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390337) 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, 54232 + ... + 54752.

It is an arithmetic number, because the mean of its divisors is an integer number (1461600).

Almost surely, 2^28390332 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 28390332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35078400).

28390332 is an abundant number, since it is smaller than the sum of its proper divisors (41766468).

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

28390332 is a wasteful number, since it uses less digits than its factorization.

28390332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 28390332 is about 5328.2578766422. The cubic root of 28390332 is about 305.0634356990.

The spelling of 28390332 in words is "twenty-eight million, three hundred ninety thousand, three hundred thirty-two".