85155990 has 32 divisors (see below), whose sum is σ = 204927840. Its totient is φ = 22646784.

The previous prime is 85155989. The next prime is 85155991. The reversal of 85155990 is 9955158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (85155989) and next prime (85155991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85155991) 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 15 ways as a sum of consecutive naturals, for example, 8022 + ... + 15318.

It is an arithmetic number, because the mean of its divisors is an integer number (6403995).

Almost surely, 2^85155990 is an apocalyptic number.

85155990 is an abundant number, since it is smaller than the sum of its proper divisors (119771850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85155990 is a wasteful number, since it uses less digits than its factorization.

85155990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696.

The product of its (nonzero) digits is 81000, while the sum is 42.

The square root of 85155990 is about 9228.0003250975. Note that the first 3 decimals coincide. The cubic root of 85155990 is about 439.9517681291.

The spelling of 85155990 in words is "eighty-five million, one hundred fifty-five thousand, nine hundred ninety".