78638332722 has 8 divisors (see below), whose sum is σ = 157276665456. Its totient is φ = 26212777572.

The previous prime is 78638332711. The next prime is 78638332727. The reversal of 78638332722 is 22723383687.

It is a happy number.

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

78638332722 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (78638332727) 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, 6553194388 + ... + 6553194399.

It is an arithmetic number, because the mean of its divisors is an integer number (19659583182).

Almost surely, 2^78638332722 is an apocalyptic number.

78638332722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78638332722 is a wasteful number, since it uses less digits than its factorization.

78638332722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13106388792.

The product of its digits is 4064256, while the sum is 51.

The spelling of 78638332722 in words is "seventy-eight billion, six hundred thirty-eight million, three hundred thirty-two thousand, seven hundred twenty-two".