78722622787 has 4 divisors (see below), whose sum is σ = 80397572256. Its totient is φ = 77047673320.

The previous prime is 78722622779. The next prime is 78722622791.

It is a happy number.

78722622787 is nontrivially palindromic in base 10.

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 78722622787 - 2³ = 78722622779 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78722622487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837474664 + ... + 837474757.

It is an arithmetic number, because the mean of its divisors is an integer number (20099393064).

Almost surely, 2^78722622787 is an apocalyptic number.

78722622787 is a deficient number, since it is larger than the sum of its proper divisors (1674949469).

78722622787 is a wasteful number, since it uses less digits than its factorization.

78722622787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674949468.

The product of its digits is 14751744, while the sum is 58.

The spelling of 78722622787 in words is "seventy-eight billion, seven hundred twenty-two million, six hundred twenty-two thousand, seven hundred eighty-seven".