78680587 has 4 divisors (see below), whose sum is σ = 78699376. Its totient is φ = 78661800.

The previous prime is 78680561. The next prime is 78680593. The reversal of 78680587 is 78508687.

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 78680587 - 2¹⁵ = 78647819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78680587.

It is not an unprimeable number, because it can be changed into a prime (78680087) 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, 58 + ... + 12544.

It is an arithmetic number, because the mean of its divisors is an integer number (19674844).

Almost surely, 2^78680587 is an apocalyptic number.

78680587 is a deficient number, since it is larger than the sum of its proper divisors (18789).

78680587 is a wasteful number, since it uses less digits than its factorization.

78680587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18788.

The product of its (nonzero) digits is 752640, while the sum is 49.

The square root of 78680587 is about 8870.2078329654. The cubic root of 78680587 is about 428.5049703351.

The spelling of 78680587 in words is "seventy-eight million, six hundred eighty thousand, five hundred eighty-seven".