28143908 has 72 divisors (see below), whose sum is σ = 59028480. Its totient is φ = 11681280.

The previous prime is 28143827. The next prime is 28143911. The reversal of 28143908 is 80934182.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356213 + ... + 356291.

It is an arithmetic number, because the mean of its divisors is an integer number (819840).

Almost surely, 2^28143908 is an apocalyptic number.

It is an amenable number.

28143908 is an abundant number, since it is smaller than the sum of its proper divisors (30884572).

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

28143908 is a wasteful number, since it uses less digits than its factorization.

28143908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28143908 is about 5305.0832227214. The cubic root of 28143908 is about 304.1782340089.

The spelling of 28143908 in words is "twenty-eight million, one hundred forty-three thousand, nine hundred eight".