28902840 has 64 divisors (see below), whose sum is σ = 87557760. Its totient is φ = 7632000.

The previous prime is 28902829. The next prime is 28902847. The reversal of 28902840 is 4820982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28902847) 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, 11715 + ... + 13965.

It is an arithmetic number, because the mean of its divisors is an integer number (1368090).

Almost surely, 2^28902840 is an apocalyptic number.

28902840 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 28902840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43778880).

28902840 is an abundant number, since it is smaller than the sum of its proper divisors (58654920).

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

28902840 is a wasteful number, since it uses less digits than its factorization.

28902840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2368 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28902840 is about 5376.1361589900. The cubic root of 28902840 is about 306.8881879812. Note that the first 3 decimals are identical.

The spelling of 28902840 in words is "twenty-eight million, nine hundred two thousand, eight hundred forty".