28657805 has 8 divisors (see below), whose sum is σ = 37515744. Its totient is φ = 20842000.

The previous prime is 28657763. The next prime is 28657807. The reversal of 28657805 is 50875682.

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

It is a de Polignac number, because none of the positive numbers 2^k-28657805 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 (28657807) 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, 260471 + ... + 260580.

It is an arithmetic number, because the mean of its divisors is an integer number (4689468).

Almost surely, 2^28657805 is an apocalyptic number.

It is an amenable number.

28657805 is a deficient number, since it is larger than the sum of its proper divisors (8857939).

28657805 is a wasteful number, since it uses less digits than its factorization.

28657805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521067.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 28657805 is about 5353.2985158685. The cubic root of 28657805 is about 306.0184711250.

The spelling of 28657805 in words is "twenty-eight million, six hundred fifty-seven thousand, eight hundred five".