78640612 has 6 divisors (see below), whose sum is σ = 137621078. Its totient is φ = 39320304.

The previous prime is 78640609. The next prime is 78640619. The reversal of 78640612 is 21604687.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 7001316 = 8464^2 + 2646^2 .

It is not an unprimeable number, because it can be changed into a prime (78640619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9830073 + ... + 9830080.

Almost surely, 2^78640612 is an apocalyptic number.

It is an amenable number.

78640612 is a deficient number, since it is larger than the sum of its proper divisors (58980466).

78640612 is a wasteful number, since it uses less digits than its factorization.

78640612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19660157 (or 19660155 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78640612 is about 8867.9542172927. The cubic root of 78640612 is about 428.4323883144.

The spelling of 78640612 in words is "seventy-eight million, six hundred forty thousand, six hundred twelve".