85578990 has 48 divisors (see below), whose sum is σ = 238926672. Its totient is φ = 19560576.

The previous prime is 85578989. The next prime is 85578991. The reversal of 85578990 is 9987558.

It is an interprime number because it is at equal distance from previous prime (85578989) and next prime (85578991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85578991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27639 + ... + 30578.

It is an arithmetic number, because the mean of its divisors is an integer number (4977639).

Almost surely, 2^85578990 is an apocalyptic number.

85578990 is an abundant number, since it is smaller than the sum of its proper divisors (153347682).

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

85578990 is a wasteful number, since it uses less digits than its factorization.

85578990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58241 (or 58234 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 51.

The square root of 85578990 is about 9250.8913084092. The cubic root of 85578990 is about 440.6790307467.

It can be divided in two parts, 85578 and 990, that added together give a palindrome (86568).

The spelling of 85578990 in words is "eighty-five million, five hundred seventy-eight thousand, nine hundred ninety".