28664870 has 32 divisors (see below), whose sum is σ = 55823040. Its totient is φ = 10535040.

The previous prime is 28664851. The next prime is 28664887. The reversal of 28664870 is 7846682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40076 + ... + 40784.

It is an arithmetic number, because the mean of its divisors is an integer number (1744470).

Almost surely, 2^28664870 is an apocalyptic number.

28664870 is a deficient number, since it is larger than the sum of its proper divisors (27158170).

28664870 is a wasteful number, since it uses less digits than its factorization.

28664870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 28664870 is about 5353.9583487360. The cubic root of 28664870 is about 306.0436166058.

It can be divided in two parts, 286 and 64870, that added together give a palindrome (65156).

The spelling of 28664870 in words is "twenty-eight million, six hundred sixty-four thousand, eight hundred seventy".