78446720331 has 12 divisors (see below), whose sum is σ = 129499347952. Its totient is φ = 44826697296.

The previous prime is 78446720249. The next prime is 78446720357. The reversal of 78446720331 is 13302764487.

It is not a de Polignac number, because 78446720331 - 2¹¹ = 78446718283 is a prime.

It is a super-2 number, since 2×78446720331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78446720381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622592956 + ... + 622593081.

Almost surely, 2^78446720331 is an apocalyptic number.

78446720331 is a deficient number, since it is larger than the sum of its proper divisors (51052627621).

78446720331 is a wasteful number, since it uses less digits than its factorization.

78446720331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245186050 (or 1245186047 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 78446720331 in words is "seventy-eight billion, four hundred forty-six million, seven hundred twenty thousand, three hundred thirty-one".