78057286 has 4 divisors (see below), whose sum is σ = 117085932. Its totient is φ = 39028642.

The previous prime is 78057283. The next prime is 78057289. The reversal of 78057286 is 68275087.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (78057283) and next prime (78057289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057281) 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, 19514320 + ... + 19514323.

It is an arithmetic number, because the mean of its divisors is an integer number (29271483).

Almost surely, 2^78057286 is an apocalyptic number.

78057286 is a deficient number, since it is larger than the sum of its proper divisors (39028646).

78057286 is a wasteful number, since it uses less digits than its factorization.

78057286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39028645.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 78057286 is about 8835.0034521782. The cubic root of 78057286 is about 427.3704423701.

The spelling of 78057286 in words is "seventy-eight million, fifty-seven thousand, two hundred eighty-six".