85081720 has 16 divisors (see below), whose sum is σ = 191433960. Its totient is φ = 34032672.

The previous prime is 85081697. The next prime is 85081727. The reversal of 85081720 is 2718058.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85081727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063482 + ... + 1063561.

Almost surely, 2^85081720 is an apocalyptic number.

It is an amenable number.

85081720 is an abundant number, since it is smaller than the sum of its proper divisors (106352240).

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

85081720 is a wasteful number, since it uses less digits than its factorization.

85081720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127054 (or 2127050 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 85081720 is about 9223.9752818403. The cubic root of 85081720 is about 439.8238275430.

Adding to 85081720 its reverse (2718058), we get a palindrome (87799778).

The spelling of 85081720 in words is "eighty-five million, eighty-one thousand, seven hundred twenty".