85129779 has 8 divisors (see below), whose sum is σ = 129721600. Its totient is φ = 48645576.

The previous prime is 85129777. The next prime is 85129783. The reversal of 85129779 is 97792158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85129779 - 2¹ = 85129777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85129771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2026879 + ... + 2026920.

It is an arithmetic number, because the mean of its divisors is an integer number (16215200).

Almost surely, 2^85129779 is an apocalyptic number.

85129779 is a deficient number, since it is larger than the sum of its proper divisors (44591821).

85129779 is a wasteful number, since it uses less digits than its factorization.

85129779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053809.

The product of its digits is 317520, while the sum is 48.

The square root of 85129779 is about 9226.5800272907. The cubic root of 85129779 is about 439.9066244693.

The spelling of 85129779 in words is "eighty-five million, one hundred twenty-nine thousand, seven hundred seventy-nine".