28985731 has 8 divisors (see below), whose sum is σ = 30817584. Its totient is φ = 27168000.

The previous prime is 28985717. The next prime is 28985767. The reversal of 28985731 is 13758982.

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

It is a cyclic number.

It is not a de Polignac number, because 28985731 - 2⁹ = 28985219 is a prime.

It is a super-2 number, since 2×28985731² = 1680345203208722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28985701) 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, 871 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (3852198).

Almost surely, 2^28985731 is an apocalyptic number.

28985731 is a deficient number, since it is larger than the sum of its proper divisors (1831853).

28985731 is a wasteful number, since it uses less digits than its factorization.

28985731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7061.

The product of its digits is 120960, while the sum is 43.

The square root of 28985731 is about 5383.8398007370. The cubic root of 28985731 is about 307.1812847745.

The spelling of 28985731 in words is "twenty-eight million, nine hundred eighty-five thousand, seven hundred thirty-one".