78621903 has 12 divisors (see below), whose sum is σ = 114162048. Its totient is φ = 52139040.

The previous prime is 78621839. The next prime is 78621911. The reversal of 78621903 is 30912687.

It is not a de Polignac number, because 78621903 - 2⁶ = 78621839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78621913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21150 + ... + 24587.

It is an arithmetic number, because the mean of its divisors is an integer number (9513504).

Almost surely, 2^78621903 is an apocalyptic number.

78621903 is a deficient number, since it is larger than the sum of its proper divisors (35540145).

78621903 is a wasteful number, since it uses less digits than its factorization.

78621903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45934 (or 45931 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 78621903 is about 8866.8992889285. The cubic root of 78621903 is about 428.3984102079.

It can be divided in two parts, 78621 and 903, that added together give a square (79524 = 282²).

The spelling of 78621903 in words is "seventy-eight million, six hundred twenty-one thousand, nine hundred three".