78213721713304 has 8 divisors (see below), whose sum is σ = 146650728212460. Its totient is φ = 39106860856648.

The previous prime is 78213721713301. The next prime is 78213721713331. The reversal of 78213721713304 is 40331712731287.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78213721713304² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78213721713301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4888357607074 + ... + 4888357607089.

Almost surely, 2^{78213721713304} is an apocalyptic number.

It is an amenable number.

78213721713304 is a deficient number, since it is larger than the sum of its proper divisors (68437006499156).

78213721713304 is a wasteful number, since it uses less digits than its factorization.

78213721713304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9776715214169 (or 9776715214165 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 78213721713304 in words is "seventy-eight trillion, two hundred thirteen billion, seven hundred twenty-one million, seven hundred thirteen thousand, three hundred four".