78420656922 has 16 divisors (see below), whose sum is σ = 159182229792. Its totient is φ = 25750066320.

The previous prime is 78420656911. The next prime is 78420656927. The reversal of 78420656922 is 22965602487.

It is a happy number.

It is a super-2 number, since 2×78420656922² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78420656927) 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, 97537729 + ... + 97538532.

It is an arithmetic number, because the mean of its divisors is an integer number (9948889362).

Almost surely, 2^78420656922 is an apocalyptic number.

78420656922 is an abundant number, since it is smaller than the sum of its proper divisors (80761572870).

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

78420656922 is a wasteful number, since it uses less digits than its factorization.

78420656922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195076333.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 78420656922 in words is "seventy-eight billion, four hundred twenty million, six hundred fifty-six thousand, nine hundred twenty-two".