28742 has 8 divisors (see below), whose sum is σ = 49296. Its totient is φ = 12312.

The previous prime is 28729. The next prime is 28751. The reversal of 28742 is 24782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28742² = 1652205128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

28742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013 + ... + 1040.

It is an arithmetic number, because the mean of its divisors is an integer number (6162).

2²⁸⁷⁴² is an apocalyptic number.

28742 is a deficient number, since it is larger than the sum of its proper divisors (20554).

28742 is a wasteful number, since it uses less digits than its factorization.

28742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062.

The product of its digits is 896, while the sum is 23.

The square root of 28742 is about 169.5346572238. The cubic root of 28742 is about 30.6317866398.

The spelling of 28742 in words is "twenty-eight thousand, seven hundred forty-two".