78493688 has 96 divisors (see below), whose sum is σ = 187785360. Its totient is φ = 30481920.

The previous prime is 78493673. The next prime is 78493699. The reversal of 78493688 is 88639487.

It is a happy number.

It is a super-2 number, since 2×78493688² = 12322518111682688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 371903 + ... + 372113.

Almost surely, 2^78493688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78493688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93892680).

78493688 is an abundant number, since it is smaller than the sum of its proper divisors (109291672).

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

78493688 is a wasteful number, since it uses less digits than its factorization.

78493688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 306 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The square root of 78493688 is about 8859.6663594065. Note that the first 3 decimals coincide. The cubic root of 78493688 is about 428.1654090333.

The spelling of 78493688 in words is "seventy-eight million, four hundred ninety-three thousand, six hundred eighty-eight".