78676109 has 6 divisors (see below), whose sum is σ = 81296910. Its totient is φ = 76137240.

The previous prime is 78676099. The next prime is 78676121. The reversal of 78676109 is 90167687.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 12709225 = 8122^2 + 3565^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78676109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78676109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78676139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39974 + ... + 41895.

It is an arithmetic number, because the mean of its divisors is an integer number (13549485).

Almost surely, 2^78676109 is an apocalyptic number.

It is an amenable number.

78676109 is a deficient number, since it is larger than the sum of its proper divisors (2620801).

78676109 is an equidigital number, since it uses as much as digits as its factorization.

78676109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81931 (or 81900 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 78676109 is about 8869.9554113874. The cubic root of 78676109 is about 428.4968409191.

The spelling of 78676109 in words is "seventy-eight million, six hundred seventy-six thousand, one hundred nine".