85991624 has 8 divisors (see below), whose sum is σ = 161234310. Its totient is φ = 42995808.

The previous prime is 85991617. The next prime is 85991657. The reversal of 85991624 is 42619958.

It can be written as a sum of positive squares in only one way, i.e., 84971524 + 1020100 = 9218^2 + 1010^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5374469 + ... + 5374484.

Almost surely, 2^85991624 is an apocalyptic number.

It is an amenable number.

85991624 is a deficient number, since it is larger than the sum of its proper divisors (75242686).

85991624 is a wasteful number, since it uses less digits than its factorization.

85991624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10748959 (or 10748955 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 85991624 is about 9273.1668808450. The cubic root of 85991624 is about 441.3861656605.

The spelling of 85991624 in words is "eighty-five million, nine hundred ninety-one thousand, six hundred twenty-four".