28392840 has 192 divisors, whose sum is σ = 111196800. Its totient is φ = 6137856.

The previous prime is 28392823. The next prime is 28392851. The reversal of 28392840 is 4829382.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28392795 and 28392804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47584 + ... + 48176.

It is an arithmetic number, because the mean of its divisors is an integer number (579150).

Almost surely, 2^28392840 is an apocalyptic number.

28392840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28392840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55598400).

28392840 is an abundant number, since it is smaller than the sum of its proper divisors (82803960).

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

28392840 is a wasteful number, since it uses less digits than its factorization.

28392840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28392840 is about 5328.4932204142. The cubic root of 28392840 is about 305.0724185289.

The spelling of 28392840 in words is "twenty-eight million, three hundred ninety-two thousand, eight hundred forty".