28708320 has 48 divisors (see below), whose sum is σ = 90432720. Its totient is φ = 7655424.

The previous prime is 28708319. The next prime is 28708327. The reversal of 28708320 is 2380782.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28708327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29425 + ... + 30384.

It is an arithmetic number, because the mean of its divisors is an integer number (1884015).

Almost surely, 2^28708320 is an apocalyptic number.

28708320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28708320 is an abundant number, since it is smaller than the sum of its proper divisors (61724400).

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

28708320 is a wasteful number, since it uses less digits than its factorization.

28708320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59827 (or 59819 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28708320 is about 5358.0145576510. The cubic root of 28708320 is about 306.1981714319.

The spelling of 28708320 in words is "twenty-eight million, seven hundred eight thousand, three hundred twenty".