8728428 has 12 divisors (see below), whose sum is σ = 20366360. Its totient is φ = 2909472.

The previous prime is 8728427. The next prime is 8728457. The reversal of 8728428 is 8248278.

8728428 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (8728427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363673 + ... + 363696.

Almost surely, 2^8728428 is an apocalyptic number.

It is an amenable number.

8728428 is an abundant number, since it is smaller than the sum of its proper divisors (11637932).

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

8728428 is a wasteful number, since it uses less digits than its factorization.

8728428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727376 (or 727374 counting only the distinct ones).

The product of its digits is 57344, while the sum is 39.

The square root of 8728428 is about 2954.3913078670. The cubic root of 8728428 is about 205.8947839857.

The spelling of 8728428 in words is "eight million, seven hundred twenty-eight thousand, four hundred twenty-eight".