78147637064 has 24 divisors (see below), whose sum is σ = 170449566390. Its totient is φ = 33491844288.

The previous prime is 78147637019. The next prime is 78147637153. The reversal of 78147637064 is 46073674187.

It can be written as a sum of positive squares in only one way, i.e., 61023820900 + 17123816164 = 247030^2 + 130858^2 .

It is a super-2 number, since 2×78147637064² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78147636997 and 78147637015.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99677717 + ... + 99678500.

Almost surely, 2^78147637064 is an apocalyptic number.

It is an amenable number.

78147637064 is an abundant number, since it is smaller than the sum of its proper divisors (92301929326).

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

78147637064 is a wasteful number, since it uses less digits than its factorization.

78147637064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199356237 (or 199356226 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 78147637064 in words is "seventy-eight billion, one hundred forty-seven million, six hundred thirty-seven thousand, sixty-four".