78765612 has 12 divisors (see below), whose sum is σ = 183786456. Its totient is φ = 26255200.

The previous prime is 78765587. The next prime is 78765619. The reversal of 78765612 is 21656787.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78765619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281889 + ... + 3281912.

It is an arithmetic number, because the mean of its divisors is an integer number (15315538).

Almost surely, 2^78765612 is an apocalyptic number.

It is an amenable number.

78765612 is an abundant number, since it is smaller than the sum of its proper divisors (105020844).

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

78765612 is a wasteful number, since it uses less digits than its factorization.

78765612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6563808 (or 6563806 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 78765612 is about 8874.9992676056. Note that the first 3 decimals coincide. The cubic root of 78765612 is about 428.6592672655.

The spelling of 78765612 in words is "seventy-eight million, seven hundred sixty-five thousand, six hundred twelve".