28786976506 has 4 divisors (see below), whose sum is σ = 43180464762. Its totient is φ = 14393488252.

The previous prime is 28786976497. The next prime is 28786976521. The reversal of 28786976506 is 60567968782.

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

It can be written as a sum of positive squares in only one way, i.e., 24913781281 + 3873195225 = 157841^2 + 62235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7196744125 + ... + 7196744128.

Almost surely, 2^28786976506 is an apocalyptic number.

28786976506 is a deficient number, since it is larger than the sum of its proper divisors (14393488256).

28786976506 is a wasteful number, since it uses less digits than its factorization.

28786976506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14393488255.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 28786976506 in words is "twenty-eight billion, seven hundred eighty-six million, nine hundred seventy-six thousand, five hundred six".