85128770 has 8 divisors (see below), whose sum is σ = 153231804. Its totient is φ = 34051504.

The previous prime is 85128763. The next prime is 85128803. The reversal of 85128770 is 7782158.

It can be written as a sum of positive squares in 2 ways, for example, as 81956809 + 3171961 = 9053^2 + 1781^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256429 + ... + 4256448.

Almost surely, 2^85128770 is an apocalyptic number.

85128770 is a deficient number, since it is larger than the sum of its proper divisors (68103034).

85128770 is a wasteful number, since it uses less digits than its factorization.

85128770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8512884.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 85128770 is about 9226.5253481470. The cubic root of 85128770 is about 439.9048864659.

The spelling of 85128770 in words is "eighty-five million, one hundred twenty-eight thousand, seven hundred seventy".