28331439897 has 8 divisors (see below), whose sum is σ = 37954283680. Its totient is φ = 18798111360.

The previous prime is 28331439883. The next prime is 28331439907. The reversal of 28331439897 is 79893413382.

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

It is not a de Polignac number, because 28331439897 - 2⁶ = 28331439833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28331439827) 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, 22378072 + ... + 22379337.

It is an arithmetic number, because the mean of its divisors is an integer number (4744285460).

Almost surely, 2^28331439897 is an apocalyptic number.

It is an amenable number.

28331439897 is a deficient number, since it is larger than the sum of its proper divisors (9622843783).

28331439897 is a wasteful number, since it uses less digits than its factorization.

28331439897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44757623.

The product of its digits is 7838208, while the sum is 57.

The spelling of 28331439897 in words is "twenty-eight billion, three hundred thirty-one million, four hundred thirty-nine thousand, eight hundred ninety-seven".