85687739 has 4 divisors (see below), whose sum is σ = 90197640. Its totient is φ = 81177840.

The previous prime is 85687729. The next prime is 85687741. The reversal of 85687739 is 93778658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85687739 - 2¹² = 85683643 is a prime.

It is a super-2 number, since 2×85687739² = 14684777229864242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85687729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2254922 + ... + 2254959.

It is an arithmetic number, because the mean of its divisors is an integer number (22549410).

Almost surely, 2^85687739 is an apocalyptic number.

85687739 is a deficient number, since it is larger than the sum of its proper divisors (4509901).

85687739 is a wasteful number, since it uses less digits than its factorization.

85687739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509900.

The product of its digits is 2540160, while the sum is 53.

The square root of 85687739 is about 9256.7672002703. The cubic root of 85687739 is about 440.8656151672.

The spelling of 85687739 in words is "eighty-five million, six hundred eighty-seven thousand, seven hundred thirty-nine".