28219957979 has 4 divisors (see below), whose sum is σ = 28982659584. Its totient is φ = 27457256376.

The previous prime is 28219957967. The next prime is 28219958021. The reversal of 28219957979 is 97975991282.

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

It is a cyclic number.

It is not a de Polignac number, because 28219957979 - 2⁸ = 28219957723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28219957079) 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, 381350747 + ... + 381350820.

It is an arithmetic number, because the mean of its divisors is an integer number (7245664896).

Almost surely, 2^28219957979 is an apocalyptic number.

28219957979 is a deficient number, since it is larger than the sum of its proper divisors (762701605).

28219957979 is an equidigital number, since it uses as much as digits as its factorization.

28219957979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762701604.

The product of its digits is 51438240, while the sum is 68.

The spelling of 28219957979 in words is "twenty-eight billion, two hundred nineteen million, nine hundred fifty-seven thousand, nine hundred seventy-nine".