85761639 has 16 divisors (see below), whose sum is σ = 128029440. Its totient is φ = 56735640.

The previous prime is 85761631. The next prime is 85761647. The reversal of 85761639 is 93616758.

It is a happy number.

85761639 is a `hidden beast` number, since 8 + 5 + 7 + 6 + 1 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (85761631) and next prime (85761647).

It is not a de Polignac number, because 85761639 - 2³ = 85761631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85761594 and 85761603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85761631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8587 + ... + 15660.

It is an arithmetic number, because the mean of its divisors is an integer number (8001840).

Almost surely, 2^85761639 is an apocalyptic number.

85761639 is a deficient number, since it is larger than the sum of its proper divisors (42267801).

85761639 is a wasteful number, since it uses less digits than its factorization.

85761639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24387 (or 24381 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 85761639 is about 9260.7580143312. The cubic root of 85761639 is about 440.9923178818.

The spelling of 85761639 in words is "eighty-five million, seven hundred sixty-one thousand, six hundred thirty-nine".