78212893736 has 16 divisors (see below), whose sum is σ = 146657519700. Its totient is φ = 39104221824.

The previous prime is 78212893723. The next prime is 78212893817. The reversal of 78212893736 is 63739821287.

It can be written as a sum of positive squares in 2 ways, for example, as 61600261636 + 16612632100 = 248194^2 + 128890^2 .

It is a super-2 number, since 2×78212893736² (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, 123695 + ... + 414398.

Almost surely, 2^78212893736 is an apocalyptic number.

It is an amenable number.

78212893736 is a deficient number, since it is larger than the sum of its proper divisors (68444625964).

78212893736 is a wasteful number, since it uses less digits than its factorization.

78212893736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556268 (or 556264 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 56.

The spelling of 78212893736 in words is "seventy-eight billion, two hundred twelve million, eight hundred ninety-three thousand, seven hundred thirty-six".