78328827172 has 12 divisors (see below), whose sum is σ = 137513390476. Its totient is φ = 39039287040.

The previous prime is 78328827167. The next prime is 78328827197. The reversal of 78328827172 is 27172882387.

It can be written as a sum of positive squares in 2 ways, for example, as 7739776576 + 70589050596 = 87976^2 + 265686^2 .

It is a super-2 number, since 2×78328827172² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31280229 + ... + 31282732.

Almost surely, 2^78328827172 is an apocalyptic number.

It is an amenable number.

78328827172 is a deficient number, since it is larger than the sum of its proper divisors (59184563304).

78328827172 is a wasteful number, since it uses less digits than its factorization.

78328827172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62563278 (or 62563276 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 55.

The spelling of 78328827172 in words is "seventy-eight billion, three hundred twenty-eight million, eight hundred twenty-seven thousand, one hundred seventy-two".