78691734 has 24 divisors (see below), whose sum is σ = 185999112. Its totient is φ = 23845920.

The previous prime is 78691729. The next prime is 78691757. The reversal of 78691734 is 43719687.

It is a self number, because there is not a number n which added to its sum of digits gives 78691734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198519 + ... + 198914.

It is an arithmetic number, because the mean of its divisors is an integer number (7749963).

Almost surely, 2^78691734 is an apocalyptic number.

78691734 is an abundant number, since it is smaller than the sum of its proper divisors (107307378).

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

78691734 is a wasteful number, since it uses less digits than its factorization.

78691734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397452 (or 397449 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 78691734 is about 8870.8361499917. The cubic root of 78691734 is about 428.5252053958.

The spelling of 78691734 in words is "seventy-eight million, six hundred ninety-one thousand, seven hundred thirty-four".