78057172 has 6 divisors (see below), whose sum is σ = 136600058. Its totient is φ = 39028584.

The previous prime is 78057167. The next prime is 78057173. The reversal of 78057172 is 27175087.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 36917776 = 6414^2 + 6076^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057173) 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 as a sum of consecutive naturals, namely, 9757143 + ... + 9757150.

Almost surely, 2^78057172 is an apocalyptic number.

It is an amenable number.

78057172 is a deficient number, since it is larger than the sum of its proper divisors (58542886).

78057172 is a wasteful number, since it uses less digits than its factorization.

78057172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19514297 (or 19514295 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 78057172 is about 8834.9970005654. The cubic root of 78057172 is about 427.3702343167.

The spelling of 78057172 in words is "seventy-eight million, fifty-seven thousand, one hundred seventy-two".