28908606407 has 4 divisors (see below), whose sum is σ = 29092737816. Its totient is φ = 28724475000.

The previous prime is 28908606373. The next prime is 28908606427. The reversal of 28908606407 is 70460680982.

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-28908606407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28908606427) 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, 92065469 + ... + 92065782.

It is an arithmetic number, because the mean of its divisors is an integer number (7273184454).

Almost surely, 2^28908606407 is an apocalyptic number.

28908606407 is a deficient number, since it is larger than the sum of its proper divisors (184131409).

28908606407 is a wasteful number, since it uses less digits than its factorization.

28908606407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184131408.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 28908606407 in words is "twenty-eight billion, nine hundred eight million, six hundred six thousand, four hundred seven".