28786631 has 8 divisors (see below), whose sum is σ = 30220800. Its totient is φ = 27384120.

The previous prime is 28786621. The next prime is 28786643. The reversal of 28786631 is 13668782.

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-28786631 is a prime.

It is a super-2 number, since 2×28786631² = 1657340248660322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28786621) 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, 6041 + ... + 9698.

It is an arithmetic number, because the mean of its divisors is an integer number (3777600).

Almost surely, 2^28786631 is an apocalyptic number.

28786631 is a deficient number, since it is larger than the sum of its proper divisors (1434169).

28786631 is a wasteful number, since it uses less digits than its factorization.

28786631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15829.

The product of its digits is 96768, while the sum is 41.

The square root of 28786631 is about 5365.3174183826. The cubic root of 28786631 is about 306.4763360295.

The spelling of 28786631 in words is "twenty-eight million, seven hundred eighty-six thousand, six hundred thirty-one".