28431078 has 32 divisors (see below), whose sum is σ = 63352800. Its totient is φ = 8445696.

The previous prime is 28431071. The next prime is 28431079. The reversal of 28431078 is 87013482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4023 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (1979775).

Almost surely, 2^28431078 is an apocalyptic number.

28431078 is an abundant number, since it is smaller than the sum of its proper divisors (34921722).

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

28431078 is a wasteful number, since it uses less digits than its factorization.

28431078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12616.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28431078 is about 5332.0800819193. The cubic root of 28431078 is about 305.2093089831.

The spelling of 28431078 in words is "twenty-eight million, four hundred thirty-one thousand, seventy-eight".