28734861 has 12 divisors (see below), whose sum is σ = 39592896. Its totient is φ = 18536760.

The previous prime is 28734857. The next prime is 28734863. The reversal of 28734861 is 16843782.

It is not a de Polignac number, because 28734861 - 2² = 28734857 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28734863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 7866.

It is an arithmetic number, because the mean of its divisors is an integer number (3299408).

Almost surely, 2^28734861 is an apocalyptic number.

It is an amenable number.

28734861 is a deficient number, since it is larger than the sum of its proper divisors (10858035).

28734861 is an equidigital number, since it uses as much as digits as its factorization.

28734861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10032 (or 10001 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28734861 is about 5360.4907424601. The cubic root of 28734861 is about 306.2925030000.

The spelling of 28734861 in words is "twenty-eight million, seven hundred thirty-four thousand, eight hundred sixty-one".