28840858 has 4 divisors (see below), whose sum is σ = 43261290. Its totient is φ = 14420428.

The previous prime is 28840807. The next prime is 28840883. The reversal of 28840858 is 85804882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17665209 + 11175649 = 4203^2 + 3343^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7210213 + ... + 7210216.

Almost surely, 2^28840858 is an apocalyptic number.

28840858 is a deficient number, since it is larger than the sum of its proper divisors (14420432).

28840858 is a wasteful number, since it uses less digits than its factorization.

28840858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14420431.

The product of its (nonzero) digits is 163840, while the sum is 43.

The square root of 28840858 is about 5370.3685162193. The cubic root of 28840858 is about 306.6686575695.

The spelling of 28840858 in words is "twenty-eight million, eight hundred forty thousand, eight hundred fifty-eight".