28676407 has 4 divisors (see below), whose sum is σ = 28782496. Its totient is φ = 28570320.

The previous prime is 28676387. The next prime is 28676411. The reversal of 28676407 is 70467682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28676407 is a prime.

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 28676407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28676437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52638 + ... + 53179.

It is an arithmetic number, because the mean of its divisors is an integer number (7195624).

Almost surely, 2^28676407 is an apocalyptic number.

28676407 is a deficient number, since it is larger than the sum of its proper divisors (106089).

28676407 is a wasteful number, since it uses less digits than its factorization.

28676407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106088.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 28676407 is about 5355.0356674816. The cubic root of 28676407 is about 306.0846697790.

The spelling of 28676407 in words is "twenty-eight million, six hundred seventy-six thousand, four hundred seven".