78585877 has 4 divisors (see below), whose sum is σ = 78606976. Its totient is φ = 78564780.

The previous prime is 78585863. The next prime is 78585931. The reversal of 78585877 is 77858587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77858587 = 8219 ⋅9473.

It is a cyclic number.

It is not a de Polignac number, because 78585877 - 2²³ = 70197269 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 (78585827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3303 + ... + 12964.

It is an arithmetic number, because the mean of its divisors is an integer number (19651744).

Almost surely, 2^78585877 is an apocalyptic number.

It is an amenable number.

78585877 is a deficient number, since it is larger than the sum of its proper divisors (21099).

78585877 is a wasteful number, since it uses less digits than its factorization.

78585877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21098.

The product of its digits is 4390400, while the sum is 55.

The square root of 78585877 is about 8864.8675681028. The cubic root of 78585877 is about 428.3329668711.

The spelling of 78585877 in words is "seventy-eight million, five hundred eighty-five thousand, eight hundred seventy-seven".