78638283687 has 8 divisors (see below), whose sum is σ = 104862328704. Its totient is φ = 52419880568.

The previous prime is 78638283649. The next prime is 78638283697.

78638283687 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78638283687 - 2⁸ = 78638283431 is a prime.

It is a super-2 number, since 2×78638283687² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638283697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1377843 + ... + 1433780.

It is an arithmetic number, because the mean of its divisors is an integer number (13107791088).

Almost surely, 2^78638283687 is an apocalyptic number.

78638283687 is a deficient number, since it is larger than the sum of its proper divisors (26224045017).

78638283687 is a wasteful number, since it uses less digits than its factorization.

78638283687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820949.

The product of its digits is 130056192, while the sum is 66.

The spelling of 78638283687 in words is "seventy-eight billion, six hundred thirty-eight million, two hundred eighty-three thousand, six hundred eighty-seven".