28349731 has 8 divisors (see below), whose sum is σ = 29654784. Its totient is φ = 27050760.

The previous prime is 28349723. The next prime is 28349743. The reversal of 28349731 is 13794382.

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

It is not a de Polignac number, because 28349731 - 2³ = 28349723 is a prime.

It is a super-2 number, since 2×28349731² = 1607414495544722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28344731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9936 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (3706848).

Almost surely, 2^28349731 is an apocalyptic number.

28349731 is a deficient number, since it is larger than the sum of its proper divisors (1305053).

28349731 is a wasteful number, since it uses less digits than its factorization.

28349731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041.

The product of its digits is 36288, while the sum is 37.

The square root of 28349731 is about 5324.4465440081. The cubic root of 28349731 is about 304.9179426300.

The spelling of 28349731 in words is "twenty-eight million, three hundred forty-nine thousand, seven hundred thirty-one".