28850640 has 160 divisors (see below), whose sum is σ = 110159616. Its totient is φ = 6082560.

The previous prime is 28850623. The next prime is 28850681. The reversal of 28850640 is 4605882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21180 + ... + 22500.

Almost surely, 2^28850640 is an apocalyptic number.

28850640 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 28850640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55079808).

28850640 is an abundant number, since it is smaller than the sum of its proper divisors (81308976).

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

28850640 is a wasteful number, since it uses less digits than its factorization.

28850640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28850640 is about 5371.2791772538. The cubic root of 28850640 is about 306.7033247504.

The spelling of 28850640 in words is "twenty-eight million, eight hundred fifty thousand, six hundred forty".