78263903 has 4 divisors (see below), whose sum is σ = 82867680. Its totient is φ = 73660128.

The previous prime is 78263893. The next prime is 78263921. The reversal of 78263903 is 30936287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30936287 = 563 ⋅54949.

It is a cyclic number.

It is not a de Polignac number, because 78263903 - 2²² = 74069599 is a prime.

It is a super-2 number, since 2×78263903² = 12250477025586818, 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 (78263923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301863 + ... + 2301896.

It is an arithmetic number, because the mean of its divisors is an integer number (20716920).

Almost surely, 2^78263903 is an apocalyptic number.

78263903 is a deficient number, since it is larger than the sum of its proper divisors (4603777).

78263903 is a wasteful number, since it uses less digits than its factorization.

78263903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4603776.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 78263903 is about 8846.6888155965. The cubic root of 78263903 is about 427.7471921736.

The spelling of 78263903 in words is "seventy-eight million, two hundred sixty-three thousand, nine hundred three".