78213673686470 has 64 divisors (see below), whose sum is σ = 161323136922240. Its totient is φ = 26745061635072.

The previous prime is 78213673686373. The next prime is 78213673686497. The reversal of 78213673686470 is 7468637631287.

It is a super-2 number, since 2×78213673686470² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78213673686470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216275642 + ... + 216636978.

It is an arithmetic number, because the mean of its divisors is an integer number (2520674014410).

Almost surely, 2^{78213673686470} is an apocalyptic number.

78213673686470 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78213673686470 is an abundant number, since it is smaller than the sum of its proper divisors (83109463235770).

78213673686470 is a wasteful number, since it uses less digits than its factorization.

78213673686470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369537.

The product of its (nonzero) digits is 341397504, while the sum is 68.

The spelling of 78213673686470 in words is "seventy-eight trillion, two hundred thirteen billion, six hundred seventy-three million, six hundred eighty-six thousand, four hundred seventy".