28991708 has 6 divisors (see below), whose sum is σ = 50735496. Its totient is φ = 14495852.

The previous prime is 28991659. The next prime is 28991723. The reversal of 28991708 is 80719982.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3623960 + ... + 3623967.

It is an arithmetic number, because the mean of its divisors is an integer number (8455916).

Almost surely, 2^28991708 is an apocalyptic number.

It is an amenable number.

28991708 is a deficient number, since it is larger than the sum of its proper divisors (21743788).

28991708 is a wasteful number, since it uses less digits than its factorization.

28991708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247931 (or 7247929 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 28991708 is about 5384.3948592205. The cubic root of 28991708 is about 307.2023974196.

The spelling of 28991708 in words is "twenty-eight million, nine hundred ninety-one thousand, seven hundred eight".