78214266765438 has 16 divisors (see below), whose sum is σ = 156429604890000. Its totient is φ = 26071243695296.

The previous prime is 78214266765421. The next prime is 78214266765533. The reversal of 78214266765438 is 83456766241287.

It is a happy number.

It is a super-2 number, since 2×78214266765438² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43689345 + ... + 45444332.

It is an arithmetic number, because the mean of its divisors is an integer number (9776850305625).

Almost surely, 2^{78214266765438} is an apocalyptic number.

78214266765438 is an abundant number, since it is smaller than the sum of its proper divisors (78215338124562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78214266765438 is a wasteful number, since it uses less digits than its factorization.

78214266765438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89279931.

The product of its digits is 650280960, while the sum is 69.

The spelling of 78214266765438 in words is "seventy-eight trillion, two hundred fourteen billion, two hundred sixty-six million, seven hundred sixty-five thousand, four hundred thirty-eight".