28735813 has 8 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 28174800.

The previous prime is 28735807. The next prime is 28735823. The reversal of 28735813 is 31853782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28735813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28735823) 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, 9478 + ... + 12136.

It is an arithmetic number, because the mean of its divisors is an integer number (3662820).

Almost surely, 2^28735813 is an apocalyptic number.

It is an amenable number.

28735813 is a deficient number, since it is larger than the sum of its proper divisors (566747).

28735813 is a wasteful number, since it uses less digits than its factorization.

28735813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867.

The product of its digits is 40320, while the sum is 37.

The square root of 28735813 is about 5360.5795395647. The cubic root of 28735813 is about 306.2958855028.

It can be divided in two parts, 287 and 35813, that added together give a square (36100 = 190²).

The spelling of 28735813 in words is "twenty-eight million, seven hundred thirty-five thousand, eight hundred thirteen".