28819870 has 16 divisors (see below), whose sum is σ = 52012368. Its totient is φ = 11497600.

The previous prime is 28819837. The next prime is 28819909. The reversal of 28819870 is 7891882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (3250773).

Almost surely, 2^28819870 is an apocalyptic number.

28819870 is a deficient number, since it is larger than the sum of its proper divisors (23192498).

28819870 is a wasteful number, since it uses less digits than its factorization.

28819870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7595.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 28819870 is about 5368.4141047427. The cubic root of 28819870 is about 306.5942501241.

The spelling of 28819870 in words is "twenty-eight million, eight hundred nineteen thousand, eight hundred seventy".