78671145 has 16 divisors (see below), whose sum is σ = 143856000. Its totient is φ = 35963904.

The previous prime is 78671143. The next prime is 78671161. The reversal of 78671145 is 54117687.

It is not a de Polignac number, because 78671145 - 2¹ = 78671143 is a prime.

It is a super-2 number, since 2×78671145² = 12378298111222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78671141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374520 + ... + 374729.

It is an arithmetic number, because the mean of its divisors is an integer number (8991000).

Almost surely, 2^78671145 is an apocalyptic number.

It is an amenable number.

78671145 is a deficient number, since it is larger than the sum of its proper divisors (65184855).

78671145 is a wasteful number, since it uses less digits than its factorization.

78671145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749264.

The product of its digits is 47040, while the sum is 39.

The square root of 78671145 is about 8869.6755859501. The cubic root of 78671145 is about 428.4878288523.

The spelling of 78671145 in words is "seventy-eight million, six hundred seventy-one thousand, one hundred forty-five".