78297607394 has 4 divisors (see below), whose sum is σ = 117446411094. Its totient is φ = 39148803696.

The previous prime is 78297607373. The next prime is 78297607403. The reversal of 78297607394 is 49370679287.

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

It can be written as a sum of positive squares in only one way, i.e., 60150015025 + 18147592369 = 245255^2 + 134713^2 .

It is a super-2 number, since 2×78297607394² (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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574401847 + ... + 19574401850.

Almost surely, 2^78297607394 is an apocalyptic number.

78297607394 is a deficient number, since it is larger than the sum of its proper divisors (39148803700).

78297607394 is a wasteful number, since it uses less digits than its factorization.

78297607394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39148803699.

The product of its (nonzero) digits is 32006016, while the sum is 62.

The spelling of 78297607394 in words is "seventy-eight billion, two hundred ninety-seven million, six hundred seven thousand, three hundred ninety-four".