28807434 has 32 divisors (see below), whose sum is σ = 64247040. Its totient is φ = 9567936.

The previous prime is 28807403. The next prime is 28807447. The reversal of 28807434 is 43470882.

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, 17407 + ... + 18989.

It is an arithmetic number, because the mean of its divisors is an integer number (2007720).

Almost surely, 2^28807434 is an apocalyptic number.

28807434 is an abundant number, since it is smaller than the sum of its proper divisors (35439606).

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

28807434 is a wasteful number, since it uses less digits than its factorization.

28807434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931 (or 1925 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 28807434 is about 5367.2557233655. The cubic root of 28807434 is about 306.5501445048.

It can be divided in two parts, 28807 and 434, that added together give a square (29241 = 171²).

The spelling of 28807434 in words is "twenty-eight million, eight hundred seven thousand, four hundred thirty-four".