78890285 has 16 divisors (see below), whose sum is σ = 100926000. Its totient is φ = 58991616.

The previous prime is 78890281. The next prime is 78890291. The reversal of 78890285 is 58209887.

It can be written as a sum of positive squares in 8 ways, for example, as 1503076 + 77387209 = 1226^2 + 8797^2 .

It is a cyclic number.

It is not a de Polignac number, because 78890285 - 2² = 78890281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78890281) 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, 9551 + ... + 15779.

It is an arithmetic number, because the mean of its divisors is an integer number (6307875).

Almost surely, 2^78890285 is an apocalyptic number.

It is an amenable number.

78890285 is a deficient number, since it is larger than the sum of its proper divisors (22035715).

78890285 is a wasteful number, since it uses less digits than its factorization.

78890285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6400.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 78890285 is about 8882.0203219763. The cubic root of 78890285 is about 428.8853137320.

The spelling of 78890285 in words is "seventy-eight million, eight hundred ninety thousand, two hundred eighty-five".