78326212387 has 4 divisors (see below), whose sum is σ = 78327135496. Its totient is φ = 78325289280.

The previous prime is 78326212381. The next prime is 78326212411. The reversal of 78326212387 is 78321262387.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78326212387 is a prime.

It is a super-2 number, since 2×78326212387² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78326212387.

It is not an unprimeable number, because it can be changed into a prime (78326212381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319758 + ... + 508819.

It is an arithmetic number, because the mean of its divisors is an integer number (19581783874).

Almost surely, 2^78326212387 is an apocalyptic number.

78326212387 is a deficient number, since it is larger than the sum of its proper divisors (923109).

78326212387 is an equidigital number, since it uses as much as digits as its factorization.

78326212387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923108.

The product of its digits is 1354752, while the sum is 49.

The spelling of 78326212387 in words is "seventy-eight billion, three hundred twenty-six million, two hundred twelve thousand, three hundred eighty-seven".