78689576 has 16 divisors (see below), whose sum is σ = 168620640. Its totient is φ = 33724080.

The previous prime is 78689551. The next prime is 78689579. The reversal of 78689576 is 67598687.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56), and also a Moran number because the ratio is a prime number: 1405171 = 78689576 / (7 + 8 + 6 + 8 + 9 + 5 + 7 + 6).

It is not an unprimeable number, because it can be changed into a prime (78689579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702530 + ... + 702641.

It is an arithmetic number, because the mean of its divisors is an integer number (10538790).

Almost surely, 2^78689576 is an apocalyptic number.

It is an amenable number.

78689576 is an abundant number, since it is smaller than the sum of its proper divisors (89931064).

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

78689576 is a wasteful number, since it uses less digits than its factorization.

78689576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405184 (or 1405180 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The square root of 78689576 is about 8870.7145146262. The cubic root of 78689576 is about 428.5212881447.

The spelling of 78689576 in words is "seventy-eight million, six hundred eighty-nine thousand, five hundred seventy-six".