28394261331 has 8 divisors (see below), whose sum is σ = 37914448320. Its totient is φ = 18901790952.

The previous prime is 28394261327. The next prime is 28394261359. The reversal of 28394261331 is 13316249382.

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

It is not a de Polignac number, because 28394261331 - 2² = 28394261327 is a prime.

It is a super-2 number, since 2×28394261331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28394265331) 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, 6926761 + ... + 6930858.

It is an arithmetic number, because the mean of its divisors is an integer number (4739306040).

Almost surely, 2^28394261331 is an apocalyptic number.

28394261331 is a deficient number, since it is larger than the sum of its proper divisors (9520186989).

28394261331 is a wasteful number, since it uses less digits than its factorization.

28394261331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13858305.

The product of its digits is 186624, while the sum is 42.

The spelling of 28394261331 in words is "twenty-eight billion, three hundred ninety-four million, two hundred sixty-one thousand, three hundred thirty-one".