78840607 has 4 divisors (see below), whose sum is σ = 78879736. Its totient is φ = 78801480.

The previous prime is 78840583. The next prime is 78840613. The reversal of 78840607 is 70604887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78840607 - 2¹⁹ = 78316319 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 78840607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78840617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16368 + ... + 20629.

It is an arithmetic number, because the mean of its divisors is an integer number (19719934).

Almost surely, 2^78840607 is an apocalyptic number.

78840607 is a deficient number, since it is larger than the sum of its proper divisors (39129).

78840607 is a wasteful number, since it uses less digits than its factorization.

78840607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39128.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 78840607 is about 8879.2233331525. The cubic root of 78840607 is about 428.7952703745.

The spelling of 78840607 in words is "seventy-eight million, eight hundred forty thousand, six hundred seven".