28947921369 has 8 divisors (see below), whose sum is σ = 38891864352. Its totient is φ = 19151296320.

The previous prime is 28947921329. The next prime is 28947921493. The reversal of 28947921369 is 96312974982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28947921369 - 2⁹ = 28947920857 is a prime.

It is a super-2 number, since 2×28947921369² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28947921329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36829024 + ... + 36829809.

It is an arithmetic number, because the mean of its divisors is an integer number (4861483044).

Almost surely, 2^28947921369 is an apocalyptic number.

It is an amenable number.

28947921369 is a deficient number, since it is larger than the sum of its proper divisors (9943942983).

28947921369 is a wasteful number, since it uses less digits than its factorization.

28947921369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73658967.

The product of its digits is 11757312, while the sum is 60.

The spelling of 28947921369 in words is "twenty-eight billion, nine hundred forty-seven million, nine hundred twenty-one thousand, three hundred sixty-nine".