85507879 has 4 divisors (see below), whose sum is σ = 86784184. Its totient is φ = 84231576.

The previous prime is 85507871. The next prime is 85507883. The reversal of 85507879 is 97870558.

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 85507879 - 2³ = 85507871 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 (85507871) 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, 638052 + ... + 638185.

It is an arithmetic number, because the mean of its divisors is an integer number (21696046).

Almost surely, 2^85507879 is an apocalyptic number.

85507879 is a deficient number, since it is larger than the sum of its proper divisors (1276305).

85507879 is a wasteful number, since it uses less digits than its factorization.

85507879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276304.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 85507879 is about 9247.0470421643. The cubic root of 85507879 is about 440.5569376554.

The spelling of 85507879 in words is "eighty-five million, five hundred seven thousand, eight hundred seventy-nine".