28499820 has 48 divisors (see below), whose sum is σ = 84496608. Its totient is φ = 7152640.

The previous prime is 28499777. The next prime is 28499831. The reversal of 28499820 is 2899482.

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, 12951 + ... + 14990.

It is an arithmetic number, because the mean of its divisors is an integer number (1760346).

Almost surely, 2^28499820 is an apocalyptic number.

28499820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28499820 is an abundant number, since it is smaller than the sum of its proper divisors (55996788).

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

28499820 is a wasteful number, since it uses less digits than its factorization.

28499820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27970 (or 27968 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28499820 is about 5338.5222674444. The cubic root of 28499820 is about 305.4550941484.

The spelling of 28499820 in words is "twenty-eight million, four hundred ninety-nine thousand, eight hundred twenty".