78479999946 has 24 divisors (see below), whose sum is σ = 170087623524. Its totient is φ = 26152673280.

The previous prime is 78479999921. The next prime is 78479999957. The reversal of 78479999946 is 64999997487.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77779074321 + 700925625 = 278889^2 + 26475^2 .

It is a super-2 number, since 2×78479999946² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 544311 + ... + 673226.

Almost surely, 2^78479999946 is an apocalyptic number.

78479999946 is an abundant number, since it is smaller than the sum of its proper divisors (91607623578).

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

78479999946 is a wasteful number, since it uses less digits than its factorization.

78479999946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221126 (or 1221123 counting only the distinct ones).

The product of its digits is 2222131968, while the sum is 81.

The spelling of 78479999946 in words is "seventy-eight billion, four hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred forty-six".