78631660 has 48 divisors (see below), whose sum is σ = 172559520. Its totient is φ = 30067200.

The previous prime is 78631639. The next prime is 78631661. The reversal of 78631660 is 6613687.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (78631661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42760 + ... + 44560.

It is an arithmetic number, because the mean of its divisors is an integer number (3594990).

Almost surely, 2^78631660 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 78631660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86279760).

78631660 is an abundant number, since it is smaller than the sum of its proper divisors (93927860).

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

78631660 is a wasteful number, since it uses less digits than its factorization.

78631660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 78631660 is about 8867.4494641921. The cubic root of 78631660 is about 428.4161309287.

The spelling of 78631660 in words is "seventy-eight million, six hundred thirty-one thousand, six hundred sixty".