78689647402 has 8 divisors (see below), whose sum is σ = 118563774336. Its totient is φ = 39168389292.

The previous prime is 78689647397. The next prime is 78689647409. The reversal of 78689647402 is 20474698687.

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

It is not an unprimeable number, because it can be changed into a prime (78689647409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88216648 + ... + 88217539.

It is an arithmetic number, because the mean of its divisors is an integer number (14820471792).

Almost surely, 2^78689647402 is an apocalyptic number.

78689647402 is a deficient number, since it is larger than the sum of its proper divisors (39874126934).

78689647402 is a wasteful number, since it uses less digits than its factorization.

78689647402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176434412.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 78689647402 in words is "seventy-eight billion, six hundred eighty-nine million, six hundred forty-seven thousand, four hundred two".