28307628 has 36 divisors (see below), whose sum is σ = 72082920. Its totient is φ = 9366336.

The previous prime is 28307621. The next prime is 28307633. The reversal of 28307628 is 82670382.

It is a happy number.

28307628 is a `hidden beast` number, since 28 + 3 + 0 + 7 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28307592 and 28307601.

It is not an unprimeable number, because it can be changed into a prime (28307621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2176 + ... + 7832.

Almost surely, 2^28307628 is an apocalyptic number.

It is an amenable number.

28307628 is an abundant number, since it is smaller than the sum of its proper divisors (43775292).

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

28307628 is a wasteful number, since it uses less digits than its factorization.

28307628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806 (or 5801 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28307628 is about 5320.4913306949. The cubic root of 28307628 is about 304.7669203772.

The spelling of 28307628 in words is "twenty-eight million, three hundred seven thousand, six hundred twenty-eight".