85155988 has 6 divisors (see below), whose sum is σ = 149022986. Its totient is φ = 42577992.

The previous prime is 85155979. The next prime is 85155989. The reversal of 85155988 is 88955158.

It can be written as a sum of positive squares in only one way, i.e., 85155984 + 4 = 9228^2 + 2^2 .

It is a super-2 number, since 2×85155988² = 14503084584512288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85155989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10644495 + ... + 10644502.

Almost surely, 2^85155988 is an apocalyptic number.

It is an amenable number.

85155988 is a deficient number, since it is larger than the sum of its proper divisors (63866998).

85155988 is a wasteful number, since it uses less digits than its factorization.

85155988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21289001 (or 21288999 counting only the distinct ones).

The product of its digits is 576000, while the sum is 49.

The square root of 85155988 is about 9228.0002167317. Note that the first 3 decimals coincide. The cubic root of 85155988 is about 439.9517646848.

The spelling of 85155988 in words is "eighty-five million, one hundred fifty-five thousand, nine hundred eighty-eight".