28428620 has 24 divisors (see below), whose sum is σ = 65127888. Its totient is φ = 10337600.

The previous prime is 28428611. The next prime is 28428637. The reversal of 28428620 is 2682482.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64391 + ... + 64830.

It is an arithmetic number, because the mean of its divisors is an integer number (2713662).

Almost surely, 2^28428620 is an apocalyptic number.

28428620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28428620 is an abundant number, since it is smaller than the sum of its proper divisors (36699268).

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

28428620 is a wasteful number, since it uses less digits than its factorization.

28428620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129241 (or 129239 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28428620 is about 5331.8495852753. The cubic root of 28428620 is about 305.2005131376.

The spelling of 28428620 in words is "twenty-eight million, four hundred twenty-eight thousand, six hundred twenty".