78688740 has 96 divisors (see below), whose sum is σ = 240468480. Its totient is φ = 19109376.

The previous prime is 78688723. The next prime is 78688741. The reversal of 78688740 is 4788687.

It is a self number, because there is not a number n which added to its sum of digits gives 78688740.

It is not an unprimeable number, because it can be changed into a prime (78688741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60982 + ... + 62258.

It is an arithmetic number, because the mean of its divisors is an integer number (2504880).

Almost surely, 2^78688740 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 78688740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120234240).

78688740 is an abundant number, since it is smaller than the sum of its proper divisors (161779740).

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

78688740 is a wasteful number, since it uses less digits than its factorization.

78688740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The square root of 78688740 is about 8870.6673931559. The cubic root of 78688740 is about 428.5197705990.

The spelling of 78688740 in words is "seventy-eight million, six hundred eighty-eight thousand, seven hundred forty".