78615487 has 4 divisors (see below), whose sum is σ = 79336840. Its totient is φ = 77894136.

The previous prime is 78615469. The next prime is 78615499. The reversal of 78615487 is 78451687.

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 78615487 - 2¹⁹ = 78091199 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 (78615457) 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, 360513 + ... + 360730.

It is an arithmetic number, because the mean of its divisors is an integer number (19834210).

Almost surely, 2^78615487 is an apocalyptic number.

78615487 is a deficient number, since it is larger than the sum of its proper divisors (721353).

78615487 is a wasteful number, since it uses less digits than its factorization.

78615487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721352.

The product of its digits is 376320, while the sum is 46.

The square root of 78615487 is about 8866.5374865276. The cubic root of 78615487 is about 428.3867566318.

The spelling of 78615487 in words is "seventy-eight million, six hundred fifteen thousand, four hundred eighty-seven".