28730872 has 8 divisors (see below), whose sum is σ = 53870400. Its totient is φ = 14365432.

The previous prime is 28730861. The next prime is 28730881. The reversal of 28730872 is 27803782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1795672 + ... + 1795687.

It is an arithmetic number, because the mean of its divisors is an integer number (6733800).

Almost surely, 2^28730872 is an apocalyptic number.

It is an amenable number.

28730872 is a deficient number, since it is larger than the sum of its proper divisors (25139528).

28730872 is a wasteful number, since it uses less digits than its factorization.

28730872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591365 (or 3591361 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 28730872 is about 5360.1186554031. The cubic root of 28730872 is about 306.2783290745.

The spelling of 28730872 in words is "twenty-eight million, seven hundred thirty thousand, eight hundred seventy-two".