78642007 has 8 divisors (see below), whose sum is σ = 82866560. Its totient is φ = 74426040.

The previous prime is 78641999. The next prime is 78642023. The reversal of 78642007 is 70024687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78642007 - 2³ = 78641999 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 (78642077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26782 + ... + 29572.

It is an arithmetic number, because the mean of its divisors is an integer number (10358320).

Almost surely, 2^78642007 is an apocalyptic number.

78642007 is a deficient number, since it is larger than the sum of its proper divisors (4224553).

78642007 is a wasteful number, since it uses less digits than its factorization.

78642007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 78642007 is about 8868.0328709359. The cubic root of 78642007 is about 428.4349216096.

The spelling of 78642007 in words is "seventy-eight million, six hundred forty-two thousand, seven".