28684780623 has 12 divisors (see below), whose sum is σ = 41542900360. Its totient is φ = 19072727856.

The previous prime is 28684780583. The next prime is 28684780627. The reversal of 28684780623 is 32608748682.

28684780623 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 4 + 7 + 8 + 0 + 623 = 666.

It is not a de Polignac number, because 28684780623 - 2¹⁴ = 28684764239 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 28684780623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684780627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4201336 + ... + 4208157.

Almost surely, 2^28684780623 is an apocalyptic number.

28684780623 is a deficient number, since it is larger than the sum of its proper divisors (12858119737).

28684780623 is a wasteful number, since it uses less digits than its factorization.

28684780623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409878 (or 8409875 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 28684780623 in words is "twenty-eight billion, six hundred eighty-four million, seven hundred eighty thousand, six hundred twenty-three".