85178990 has 16 divisors (see below), whose sum is σ = 165116448. Its totient is φ = 31450656.

The previous prime is 85178981. The next prime is 85179019. The reversal of 85178990 is 9987158.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327482 + ... + 327741.

It is an arithmetic number, because the mean of its divisors is an integer number (10319778).

Almost surely, 2^85178990 is an apocalyptic number.

85178990 is a deficient number, since it is larger than the sum of its proper divisors (79937458).

85178990 is a wasteful number, since it uses less digits than its factorization.

85178990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655243.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 85178990 is about 9229.2464481127. The cubic root of 85178990 is about 439.9913737978.

It can be divided in two parts, 85178 and 990, that added together give a palindrome (86168).

The spelling of 85178990 in words is "eighty-five million, one hundred seventy-eight thousand, nine hundred ninety".