28491000 has 64 divisors (see below), whose sum is σ = 88901280. Its totient is φ = 7596800.

The previous prime is 28490993. The next prime is 28491017. The reversal of 28491000 is 19482.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1749 + ... + 7748.

Almost surely, 2^28491000 is an apocalyptic number.

28491000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28491000 is an abundant number, since it is smaller than the sum of its proper divisors (60410280).

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

28491000 is a wasteful number, since it uses less digits than its factorization.

28491000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9521 (or 9507 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28491000 is about 5337.6961322278. The cubic root of 28491000 is about 305.4235805938.

The spelling of 28491000 in words is "twenty-eight million, four hundred ninety-one thousand".