28891500 has 192 divisors, whose sum is σ = 98122752. Its totient is φ = 6528000.

The previous prime is 28891493. The next prime is 28891507. The reversal of 28891500 is 519882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28891493) and next prime (28891507).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28891507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 280449 + ... + 280551.

It is an arithmetic number, because the mean of its divisors is an integer number (511056).

Almost surely, 2^28891500 is an apocalyptic number.

28891500 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 28891500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49061376).

28891500 is an abundant number, since it is smaller than the sum of its proper divisors (69231252).

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

28891500 is a wasteful number, since it uses less digits than its factorization.

28891500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 28891500 is about 5375.0813947325. The cubic root of 28891500 is about 306.8480469744.

The spelling of 28891500 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred".