28971802 has 8 divisors (see below), whose sum is σ = 44053236. Its totient is φ = 14287392.

The previous prime is 28971793. The next prime is 28971847. The reversal of 28971802 is 20817982.

It can be written as a sum of positive squares in 2 ways, for example, as 28955161 + 16641 = 5381^2 + 129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28971802² = 1678730622254408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99073 + ... + 99364.

Almost surely, 2^28971802 is an apocalyptic number.

28971802 is a deficient number, since it is larger than the sum of its proper divisors (15081434).

28971802 is a wasteful number, since it uses less digits than its factorization.

28971802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198512.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28971802 is about 5382.5460518234. The cubic root of 28971802 is about 307.1320718972.

The spelling of 28971802 in words is "twenty-eight million, nine hundred seventy-one thousand, eight hundred two".