28431708 has 24 divisors (see below), whose sum is σ = 66987648. Its totient is φ = 9384816.

The previous prime is 28431707. The next prime is 28431709. The reversal of 28431708 is 80713482.

It is an interprime number because it is at equal distance from previous prime (28431707) and next prime (28431709).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10266 + ... + 12737.

It is an arithmetic number, because the mean of its divisors is an integer number (2791152).

Almost surely, 2^28431708 is an apocalyptic number.

It is an amenable number.

28431708 is an abundant number, since it is smaller than the sum of its proper divisors (38555940).

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

28431708 is a wasteful number, since it uses less digits than its factorization.

28431708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23113 (or 23111 counting only the distinct ones).

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

The square root of 28431708 is about 5332.1391579740. The cubic root of 28431708 is about 305.2115633289.

The spelling of 28431708 in words is "twenty-eight million, four hundred thirty-one thousand, seven hundred eight".