78590161 has 4 divisors (see below), whose sum is σ = 84635572. Its totient is φ = 72544752.

The previous prime is 78590147. The next prime is 78590173. The reversal of 78590161 is 16109587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11350161 + 67240000 = 3369^2 + 8200^2 .

It is a cyclic number.

It is not a de Polignac number, because 78590161 - 2¹⁵ = 78557393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78590161.

It is not an unprimeable number, because it can be changed into a prime (78590101) 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, 3022686 + ... + 3022711.

It is an arithmetic number, because the mean of its divisors is an integer number (21158893).

Almost surely, 2^78590161 is an apocalyptic number.

It is an amenable number.

78590161 is a deficient number, since it is larger than the sum of its proper divisors (6045411).

78590161 is a wasteful number, since it uses less digits than its factorization.

78590161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045410.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 78590161 is about 8865.1091927849. The cubic root of 78590161 is about 428.3407500554.

The spelling of 78590161 in words is "seventy-eight million, five hundred ninety thousand, one hundred sixty-one".