78634087 has 4 divisors (see below), whose sum is σ = 89867536. Its totient is φ = 67400640.

The previous prime is 78634007. The next prime is 78634091. The reversal of 78634087 is 78043687.

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 78634087 - 2¹¹ = 78632039 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 (78634007) 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 3 ways as a sum of consecutive naturals, for example, 5616714 + ... + 5616727.

It is an arithmetic number, because the mean of its divisors is an integer number (22466884).

Almost surely, 2^78634087 is an apocalyptic number.

78634087 is a deficient number, since it is larger than the sum of its proper divisors (11233449).

78634087 is a wasteful number, since it uses less digits than its factorization.

78634087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11233448.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 78634087 is about 8867.5863119566. The cubic root of 78634087 is about 428.4205386328.

The spelling of 78634087 in words is "seventy-eight million, six hundred thirty-four thousand, eighty-seven".