28530642 has 48 divisors (see below), whose sum is σ = 67666752. Its totient is φ = 7993440.

The previous prime is 28530637. The next prime is 28530659. The reversal of 28530642 is 24603582.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14667 + ... + 16497.

It is an arithmetic number, because the mean of its divisors is an integer number (1409724).

Almost surely, 2^28530642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28530642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33833376).

28530642 is an abundant number, since it is smaller than the sum of its proper divisors (39136110).

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

28530642 is a wasteful number, since it uses less digits than its factorization.

28530642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903 (or 1896 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 28530642 is about 5341.4082412787. The cubic root of 28530642 is about 305.5651690541.

The spelling of 28530642 in words is "twenty-eight million, five hundred thirty thousand, six hundred forty-two".