78688365402 has 8 divisors (see below), whose sum is σ = 157376730816. Its totient is φ = 26229455132.

The previous prime is 78688365389. The next prime is 78688365407. The reversal of 78688365402 is 20456388687.

It is a happy number.

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

78688365402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (78688365407) 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, 6557363778 + ... + 6557363789.

It is an arithmetic number, because the mean of its divisors is an integer number (19672091352).

Almost surely, 2^78688365402 is an apocalyptic number.

78688365402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78688365402 is a wasteful number, since it uses less digits than its factorization.

78688365402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13114727572.

The product of its (nonzero) digits is 15482880, while the sum is 57.

The spelling of 78688365402 in words is "seventy-eight billion, six hundred eighty-eight million, three hundred sixty-five thousand, four hundred two".