28691748 has 36 divisors (see below), whose sum is σ = 76345360. Its totient is φ = 9060336.

The previous prime is 28691657. The next prime is 28691753. The reversal of 28691748 is 84719682.

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

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20290 + ... + 21657.

Almost surely, 2^28691748 is an apocalyptic number.

It is an amenable number.

28691748 is an abundant number, since it is smaller than the sum of its proper divisors (47653612).

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

28691748 is a wasteful number, since it uses less digits than its factorization.

28691748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41976 (or 41971 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28691748 is about 5356.4678660476. The cubic root of 28691748 is about 306.1392420252.

The spelling of 28691748 in words is "twenty-eight million, six hundred ninety-one thousand, seven hundred forty-eight".