28799197291 has 4 divisors (see below), whose sum is σ = 29025962752. Its totient is φ = 28572431832.

The previous prime is 28799197249. The next prime is 28799197319. The reversal of 28799197291 is 19279199782.

It is a happy number.

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 28799197291 - 2³¹ = 26651713643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28799192291) 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, 113382540 + ... + 113382793.

It is an arithmetic number, because the mean of its divisors is an integer number (7256490688).

Almost surely, 2^28799197291 is an apocalyptic number.

28799197291 is a deficient number, since it is larger than the sum of its proper divisors (226765461).

28799197291 is a wasteful number, since it uses less digits than its factorization.

28799197291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226765460.

The product of its digits is 10287648, while the sum is 64.

The spelling of 28799197291 in words is "twenty-eight billion, seven hundred ninety-nine million, one hundred ninety-seven thousand, two hundred ninety-one".