78957887 has 4 divisors (see below), whose sum is σ = 79063776. Its totient is φ = 78852000.

The previous prime is 78957829. The next prime is 78957913. The reversal of 78957887 is 78875987.

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 78957887 - 2¹⁰ = 78956863 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 (78957587) 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, 51818 + ... + 53319.

It is an arithmetic number, because the mean of its divisors is an integer number (19765944).

Almost surely, 2^78957887 is an apocalyptic number.

78957887 is a deficient number, since it is larger than the sum of its proper divisors (105889).

78957887 is a wasteful number, since it uses less digits than its factorization.

78957887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105888.

The product of its digits is 7902720, while the sum is 59.

The square root of 78957887 is about 8885.8250601731. The cubic root of 78957887 is about 429.0077843560.

The spelling of 78957887 in words is "seventy-eight million, nine hundred fifty-seven thousand, eight hundred eighty-seven".