78789660 has 24 divisors (see below), whose sum is σ = 220611216. Its totient is φ = 21010560.

The previous prime is 78789647. The next prime is 78789661. The reversal of 78789660 is 6698787.

It is a happy number.

It is a super-3 number, since 3×78789660³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78789661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656521 + ... + 656640.

It is an arithmetic number, because the mean of its divisors is an integer number (9192134).

Almost surely, 2^78789660 is an apocalyptic number.

It is an amenable number.

78789660 is an abundant number, since it is smaller than the sum of its proper divisors (141821556).

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

78789660 is a wasteful number, since it uses less digits than its factorization.

78789660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313173 (or 1313171 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 78789660 is about 8876.3539812245. The cubic root of 78789660 is about 428.7028876089.

The spelling of 78789660 in words is "seventy-eight million, seven hundred eighty-nine thousand, six hundred sixty".