78490085 has 16 divisors (see below), whose sum is σ = 96441840. Its totient is φ = 61301760.

The previous prime is 78490081. The next prime is 78490123. The reversal of 78490085 is 58009487.

It can be written as a sum of positive squares in 8 ways, for example, as 18783556 + 59706529 = 4334^2 + 7727^2 .

It is not a de Polignac number, because 78490085 - 2² = 78490081 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78490081) 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, 63251 + ... + 64479.

It is an arithmetic number, because the mean of its divisors is an integer number (6027615).

Almost surely, 2^78490085 is an apocalyptic number.

It is an amenable number.

78490085 is a deficient number, since it is larger than the sum of its proper divisors (17951755).

78490085 is a wasteful number, since it uses less digits than its factorization.

78490085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 78490085 is about 8859.4630198449. The cubic root of 78490085 is about 428.1588577482.

The spelling of 78490085 in words is "seventy-eight million, four hundred ninety thousand, eighty-five".