78907985321 has 16 divisors (see below), whose sum is σ = 90939226560. Its totient is φ = 67713641280.

The previous prime is 78907985279. The next prime is 78907985357. The reversal of 78907985321 is 12358970987.

It is a cyclic number.

It is not a de Polignac number, because 78907985321 - 2¹⁸ = 78907723177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78907985371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623606 + ... + 739391.

It is an arithmetic number, because the mean of its divisors is an integer number (5683701660).

Almost surely, 2^78907985321 is an apocalyptic number.

It is an amenable number.

78907985321 is a deficient number, since it is larger than the sum of its proper divisors (12031241239).

78907985321 is a wasteful number, since it uses less digits than its factorization.

78907985321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363304.

The product of its (nonzero) digits is 7620480, while the sum is 59.

The spelling of 78907985321 in words is "seventy-eight billion, nine hundred seven million, nine hundred eighty-five thousand, three hundred twenty-one".