28861500 has 96 divisors (see below), whose sum is σ = 85542912. Its totient is φ = 7560000.

The previous prime is 28861489. The next prime is 28861537. The reversal of 28861500 is 516882.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 106365 + ... + 106635.

It is an arithmetic number, because the mean of its divisors is an integer number (891072).

Almost surely, 2^28861500 is an apocalyptic number.

28861500 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 28861500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42771456).

28861500 is an abundant number, since it is smaller than the sum of its proper divisors (56681412).

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

28861500 is a wasteful number, since it uses less digits than its factorization.

28861500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 28861500 is about 5372.2900145096. The cubic root of 28861500 is about 306.7418031604.

The spelling of 28861500 in words is "twenty-eight million, eight hundred sixty-one thousand, five hundred".