78340406252 has 12 divisors (see below), whose sum is σ = 137097671256. Its totient is φ = 39169643040.

The previous prime is 78340406233. The next prime is 78340406257. The reversal of 78340406252 is 25260404387.

It is a super-2 number, since 2×78340406252² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78340406257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469427 + ... + 614037.

It is an arithmetic number, because the mean of its divisors is an integer number (11424805938).

Almost surely, 2^78340406252 is an apocalyptic number.

It is an amenable number.

78340406252 is a deficient number, since it is larger than the sum of its proper divisors (58757265004).

78340406252 is a wasteful number, since it uses less digits than its factorization.

78340406252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280048 (or 280046 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 41.

The spelling of 78340406252 in words is "seventy-eight billion, three hundred forty million, four hundred six thousand, two hundred fifty-two".