28394720 has 24 divisors (see below), whose sum is σ = 67082904. Its totient is φ = 11357824.

The previous prime is 28394701. The next prime is 28394761. The reversal of 28394720 is 2749382.

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, 88574 + ... + 88893.

It is an arithmetic number, because the mean of its divisors is an integer number (2795121).

Almost surely, 2^28394720 is an apocalyptic number.

28394720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28394720 is an abundant number, since it is smaller than the sum of its proper divisors (38688184).

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

28394720 is a wasteful number, since it uses less digits than its factorization.

28394720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177482 (or 177474 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28394720 is about 5328.6696275900. The cubic root of 28394720 is about 305.0791517228.

The spelling of 28394720 in words is "twenty-eight million, three hundred ninety-four thousand, seven hundred twenty".