78451047 has 6 divisors (see below), whose sum is σ = 113318192. Its totient is φ = 52300692.

The previous prime is 78451031. The next prime is 78451067. The reversal of 78451047 is 74015487.

It is not a de Polignac number, because 78451047 - 2⁴ = 78451031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78451007) 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 5 ways as a sum of consecutive naturals, for example, 4358383 + ... + 4358400.

Almost surely, 2^78451047 is an apocalyptic number.

78451047 is a deficient number, since it is larger than the sum of its proper divisors (34867145).

78451047 is a wasteful number, since it uses less digits than its factorization.

78451047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8716789 (or 8716786 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 78451047 is about 8857.2595648993. The cubic root of 78451047 is about 428.0878626355.

The spelling of 78451047 in words is "seventy-eight million, four hundred fifty-one thousand, forty-seven".