28994381361 has 12 divisors (see below), whose sum is σ = 45688116240. Its totient is φ = 17572352280.

The previous prime is 28994381359. The next prime is 28994381407. The reversal of 28994381361 is 16318349982.

It is not a de Polignac number, because 28994381361 - 2¹ = 28994381359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28994381298 and 28994381307.

It is not an unprimeable number, because it can be changed into a prime (28994381341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146436171 + ... + 146436368.

It is an arithmetic number, because the mean of its divisors is an integer number (3807343020).

Almost surely, 2^28994381361 is an apocalyptic number.

It is an amenable number.

28994381361 is a deficient number, since it is larger than the sum of its proper divisors (16693734879).

28994381361 is a wasteful number, since it uses less digits than its factorization.

28994381361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292872556 (or 292872553 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 28994381361 in words is "twenty-eight billion, nine hundred ninety-four million, three hundred eighty-one thousand, three hundred sixty-one".