28434840 has 64 divisors (see below), whose sum is σ = 97493760. Its totient is φ = 6499200.

The previous prime is 28434839. The next prime is 28434851. The reversal of 28434840 is 4843482.

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, 16086 + ... + 17765.

It is an arithmetic number, because the mean of its divisors is an integer number (1523340).

Almost surely, 2^28434840 is an apocalyptic number.

28434840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28434840 is an abundant number, since it is smaller than the sum of its proper divisors (69058920).

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

28434840 is a wasteful number, since it uses less digits than its factorization.

28434840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33872 (or 33868 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 28434840 is about 5332.4328406460. The cubic root of 28434840 is about 305.2227701538. Note that the first 3 decimals are identical.

The spelling of 28434840 in words is "twenty-eight million, four hundred thirty-four thousand, eight hundred forty".