28998740 has 12 divisors (see below), whose sum is σ = 60897396. Its totient is φ = 11599488.

The previous prime is 28998737. The next prime is 28998751. The reversal of 28998740 is 4789982.

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 22259524 = 2596^2 + 4718^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724949 + ... + 724988.

It is an arithmetic number, because the mean of its divisors is an integer number (5074783).

Almost surely, 2^28998740 is an apocalyptic number.

28998740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28998740 is an abundant number, since it is smaller than the sum of its proper divisors (31898656).

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

28998740 is a wasteful number, since it uses less digits than its factorization.

28998740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449946 (or 1449944 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28998740 is about 5385.0478178007. The cubic root of 28998740 is about 307.2272329418.

The spelling of 28998740 in words is "twenty-eight million, nine hundred ninety-eight thousand, seven hundred forty".