28663807 has 8 divisors (see below), whose sum is σ = 29203200. Its totient is φ = 28128984.

The previous prime is 28663787. The next prime is 28663813. The reversal of 28663807 is 70836682.

It is a happy number.

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-28663807 is a prime.

It is a super-2 number, since 2×28663807² = 1643227663466498, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 28663807 parts by 7571 straight cuts.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28663807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663847) 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, 13128 + ... + 15154.

It is an arithmetic number, because the mean of its divisors is an integer number (3650400).

Almost surely, 2^28663807 is an apocalyptic number.

28663807 is a deficient number, since it is larger than the sum of its proper divisors (539393).

28663807 is a wasteful number, since it uses less digits than its factorization.

28663807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28663807 is about 5353.8590754707. The cubic root of 28663807 is about 306.0398334805.

The spelling of 28663807 in words is "twenty-eight million, six hundred sixty-three thousand, eight hundred seven".