78078172 has 12 divisors (see below), whose sum is σ = 138509056. Its totient is φ = 38504160.

The previous prime is 78078167. The next prime is 78078173. The reversal of 78078172 is 27187087.

It is a happy number.

It is a super-3 number, since 3×78078172³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78078173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133404 + ... + 133987.

Almost surely, 2^78078172 is an apocalyptic number.

It is an amenable number.

78078172 is a deficient number, since it is larger than the sum of its proper divisors (60430884).

78078172 is a wasteful number, since it uses less digits than its factorization.

78078172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267468 (or 267466 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 78078172 is about 8836.1853760545. The cubic root of 78078172 is about 427.4085565275.

The spelling of 78078172 in words is "seventy-eight million, seventy-eight thousand, one hundred seventy-two".