78340172 has 12 divisors (see below), whose sum is σ = 137191320. Its totient is φ = 39142656.

The previous prime is 78340151. The next prime is 78340237. The reversal of 78340172 is 27104387.

It is a happy number.

It is a super-2 number, since 2×78340172² = 12274365097979168, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428 + ... + 12524.

It is an arithmetic number, because the mean of its divisors is an integer number (11432610).

Almost surely, 2^78340172 is an apocalyptic number.

It is an amenable number.

78340172 is a deficient number, since it is larger than the sum of its proper divisors (58851148).

78340172 is a wasteful number, since it uses less digits than its factorization.

78340172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13720 (or 13718 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 78340172 is about 8850.9983617669. The cubic root of 78340172 is about 427.8860951147.

The spelling of 78340172 in words is "seventy-eight million, three hundred forty thousand, one hundred seventy-two".