78668700 has 144 divisors (see below), whose sum is σ = 256650240. Its totient is φ = 18432000.

The previous prime is 78668693. The next prime is 78668719. The reversal of 78668700 is 786687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101916 + ... + 102684.

Almost surely, 2^78668700 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 78668700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128325120).

78668700 is an abundant number, since it is smaller than the sum of its proper divisors (177981540).

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

78668700 is a wasteful number, since it uses less digits than its factorization.

78668700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 78668700 is about 8869.5377557120. The cubic root of 78668700 is about 428.4833898525.

Multiplying 78668700 by its reverse (786687), we get a square (61887643596900 = 7866870²).

78668700 divided by its reverse (786687) gives a square (100 = 10²).

The spelling of 78668700 in words is "seventy-eight million, six hundred sixty-eight thousand, seven hundred".