78287903 has 4 divisors (see below), whose sum is σ = 78307008. Its totient is φ = 78268800.

The previous prime is 78287887. The next prime is 78287933. The reversal of 78287903 is 30978287.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78287903 - 2⁴ = 78287887 is a prime.

It is a super-2 number, since 2×78287903² = 12257991512274818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78287933) 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, 623 + ... + 12528.

It is an arithmetic number, because the mean of its divisors is an integer number (19576752).

Almost surely, 2^78287903 is an apocalyptic number.

78287903 is a deficient number, since it is larger than the sum of its proper divisors (19105).

78287903 is a wasteful number, since it uses less digits than its factorization.

78287903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19104.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 78287903 is about 8848.0451513315. The cubic root of 78287903 is about 427.7909112788.

The spelling of 78287903 in words is "seventy-eight million, two hundred eighty-seven thousand, nine hundred three".