78625427638 has 8 divisors (see below), whose sum is σ = 124145412120. Its totient is φ = 37243623600.

The previous prime is 78625427623. The next prime is 78625427651. The reversal of 78625427638 is 83672452687.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1034545063 + ... + 1034545138.

It is an arithmetic number, because the mean of its divisors is an integer number (15518176515).

Almost surely, 2^78625427638 is an apocalyptic number.

78625427638 is a deficient number, since it is larger than the sum of its proper divisors (45519984482).

78625427638 is a wasteful number, since it uses less digits than its factorization.

78625427638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069090222.

The product of its digits is 27095040, while the sum is 58.

The spelling of 78625427638 in words is "seventy-eight billion, six hundred twenty-five million, four hundred twenty-seven thousand, six hundred thirty-eight".