78685007 has 4 divisors (see below), whose sum is σ = 78706056. Its totient is φ = 78663960.

The previous prime is 78684997. The next prime is 78685049. The reversal of 78685007 is 70058687.

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 78685007 - 2⁶ = 78684943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78685307) 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, 3233 + ... + 12954.

It is an arithmetic number, because the mean of its divisors is an integer number (19676514).

Almost surely, 2^78685007 is an apocalyptic number.

78685007 is a deficient number, since it is larger than the sum of its proper divisors (21049).

78685007 is a wasteful number, since it uses less digits than its factorization.

78685007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21048.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 78685007 is about 8870.4569780818. The cubic root of 78685007 is about 428.5129941547.

The spelling of 78685007 in words is "seventy-eight million, six hundred eighty-five thousand, seven".