28807890 has 32 divisors (see below), whose sum is σ = 69322176. Its totient is φ = 7661760.

The previous prime is 28807859. The next prime is 28807907. The reversal of 28807890 is 9870882.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12789 + ... + 14871.

It is an arithmetic number, because the mean of its divisors is an integer number (2166318).

Almost surely, 2^28807890 is an apocalyptic number.

28807890 is an abundant number, since it is smaller than the sum of its proper divisors (40514286).

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

28807890 is a wasteful number, since it uses less digits than its factorization.

28807890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28807890 is about 5367.2982030068. The cubic root of 28807890 is about 306.5517619823.

The spelling of 28807890 in words is "twenty-eight million, eight hundred seven thousand, eight hundred ninety".