78672907 has 4 divisors (see below), whose sum is σ = 78691576. Its totient is φ = 78654240.

The previous prime is 78672883. The next prime is 78672943. The reversal of 78672907 is 70927687.

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 78672907 - 2⁷ = 78672779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78672007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307 + ... + 12547.

It is an arithmetic number, because the mean of its divisors is an integer number (19672894).

Almost surely, 2^78672907 is an apocalyptic number.

78672907 is a deficient number, since it is larger than the sum of its proper divisors (18669).

78672907 is a wasteful number, since it uses less digits than its factorization.

78672907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18668.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 78672907 is about 8869.7749125894. The cubic root of 78672907 is about 428.4910277800.

The spelling of 78672907 in words is "seventy-eight million, six hundred seventy-two thousand, nine hundred seven".