78328407266 has 8 divisors (see below), whose sum is σ = 117496801884. Its totient is φ = 39162806640.

The previous prime is 78328407259. The next prime is 78328407277. The reversal of 78328407266 is 66270482387.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62210835241 + 16117572025 = 249421^2 + 126955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78328407266² (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, 626945 + ... + 741428.

Almost surely, 2^78328407266 is an apocalyptic number.

78328407266 is a deficient number, since it is larger than the sum of its proper divisors (39168394618).

78328407266 is a wasteful number, since it uses less digits than its factorization.

78328407266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396996.

The product of its (nonzero) digits is 5419008, while the sum is 53.

The spelling of 78328407266 in words is "seventy-eight billion, three hundred twenty-eight million, four hundred seven thousand, two hundred sixty-six".