78867193646 has 8 divisors (see below), whose sum is σ = 118318103904. Its totient is φ = 39427825680.

The previous prime is 78867193619. The next prime is 78867193661. The reversal of 78867193646 is 64639176887.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2868470 + ... + 2895833.

It is an arithmetic number, because the mean of its divisors is an integer number (14789762988).

Almost surely, 2^78867193646 is an apocalyptic number.

78867193646 is a deficient number, since it is larger than the sum of its proper divisors (39450910258).

78867193646 is a wasteful number, since it uses less digits than its factorization.

78867193646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5771146.

The product of its digits is 73156608, while the sum is 65.

The spelling of 78867193646 in words is "seventy-eight billion, eight hundred sixty-seven million, one hundred ninety-three thousand, six hundred forty-six".