28998540 has 96 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 7627968.

The previous prime is 28998533. The next prime is 28998581. The reversal of 28998540 is 4589982.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 44497 + ... + 45143.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^28998540 is an apocalyptic number.

28998540 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 28998540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45722880).

28998540 is an abundant number, since it is smaller than the sum of its proper divisors (62447220).

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

28998540 is a wasteful number, since it uses less digits than its factorization.

28998540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28998540 is about 5385.0292478314. The cubic root of 28998540 is about 307.2265266400.

The spelling of 28998540 in words is "twenty-eight million, nine hundred ninety-eight thousand, five hundred forty".