28734779293 has 4 divisors (see below), whose sum is σ = 31347031968. Its totient is φ = 26122526620.

The previous prime is 28734779237. The next prime is 28734779303. The reversal of 28734779293 is 39297743782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28734779293 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 (28734779093) 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, 1306126321 + ... + 1306126342.

It is an arithmetic number, because the mean of its divisors is an integer number (7836757992).

Almost surely, 2^28734779293 is an apocalyptic number.

It is an amenable number.

28734779293 is a deficient number, since it is larger than the sum of its proper divisors (2612252675).

28734779293 is a wasteful number, since it uses less digits than its factorization.

28734779293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612252674.

The product of its digits is 32006016, while the sum is 61.

The spelling of 28734779293 in words is "twenty-eight billion, seven hundred thirty-four million, seven hundred seventy-nine thousand, two hundred ninety-three".