28867731 has 16 divisors (see below), whose sum is σ = 40793760. Its totient is φ = 18126080.

The previous prime is 28867723. The next prime is 28867753. The reversal of 28867731 is 13776882.

It is a cyclic number.

It is not a de Polignac number, because 28867731 - 2³ = 28867723 is a prime.

It is a super-2 number, since 2×28867731² = 1666691786176722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28867711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (2549610).

Almost surely, 2^28867731 is an apocalyptic number.

28867731 is a deficient number, since it is larger than the sum of its proper divisors (11926029).

28867731 is a wasteful number, since it uses less digits than its factorization.

28867731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8166.

The product of its digits is 112896, while the sum is 42.

The square root of 28867731 is about 5372.8699035059. The cubic root of 28867731 is about 306.7638760562.

The spelling of 28867731 in words is "twenty-eight million, eight hundred sixty-seven thousand, seven hundred thirty-one".