28431722 has 16 divisors (see below), whose sum is σ = 46634400. Its totient is φ = 12893040.

The previous prime is 28431709. The next prime is 28431731. The reversal of 28431722 is 22713482.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9929 + ... + 12467.

It is an arithmetic number, because the mean of its divisors is an integer number (2914650).

Almost surely, 2^28431722 is an apocalyptic number.

28431722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28431722 is a deficient number, since it is larger than the sum of its proper divisors (18202678).

28431722 is a wasteful number, since it uses less digits than its factorization.

28431722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3061.

The product of its digits is 5376, while the sum is 29.

The square root of 28431722 is about 5332.1404707678. The cubic root of 28431722 is about 305.2116134251.

The spelling of 28431722 in words is "twenty-eight million, four hundred thirty-one thousand, seven hundred twenty-two".