28231724 has 6 divisors (see below), whose sum is σ = 49405524. Its totient is φ = 14115860.

The previous prime is 28231699. The next prime is 28231733. The reversal of 28231724 is 42713282.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3528962 + ... + 3528969.

It is an arithmetic number, because the mean of its divisors is an integer number (8234254).

Almost surely, 2^28231724 is an apocalyptic number.

It is an amenable number.

28231724 is a deficient number, since it is larger than the sum of its proper divisors (21173800).

28231724 is a wasteful number, since it uses less digits than its factorization.

28231724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057935 (or 7057933 counting only the distinct ones).

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

The square root of 28231724 is about 5313.3533667544. The cubic root of 28231724 is about 304.4942761338.

The spelling of 28231724 in words is "twenty-eight million, two hundred thirty-one thousand, seven hundred twenty-four".