78045871 has 4 divisors (see below), whose sum is σ = 78083352. Its totient is φ = 78008392.

The previous prime is 78045811. The next prime is 78045883. The reversal of 78045871 is 17854087.

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 78045871 - 2⁷ = 78045743 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 (78045811) 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, 15421 + ... + 19846.

It is an arithmetic number, because the mean of its divisors is an integer number (19520838).

Almost surely, 2^78045871 is an apocalyptic number.

78045871 is a deficient number, since it is larger than the sum of its proper divisors (37481).

78045871 is a wasteful number, since it uses less digits than its factorization.

78045871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37480.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 78045871 is about 8834.3574186242. The cubic root of 78045871 is about 427.3496086479.

The spelling of 78045871 in words is "seventy-eight million, forty-five thousand, eight hundred seventy-one".