85719000781 has 8 divisors (see below), whose sum is σ = 87337273400. Its totient is φ = 84107600640.

The previous prime is 85719000779. The next prime is 85719000793. The reversal of 85719000781 is 18700091758.

It can be written as a sum of positive squares in 4 ways, for example, as 3756464100 + 81962536681 = 61290^2 + 286291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85719000781 - 2¹ = 85719000779 is a prime.

It is a super-2 number, since 2×85719000781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85719004781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692936 + ... + 1742833.

It is an arithmetic number, because the mean of its divisors is an integer number (10917159175).

Almost surely, 2^85719000781 is an apocalyptic number.

85719000781 is the 169036-th hex number.

It is an amenable number.

85719000781 is a deficient number, since it is larger than the sum of its proper divisors (1618272619).

85719000781 is a wasteful number, since it uses less digits than its factorization.

85719000781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436239.

The product of its (nonzero) digits is 141120, while the sum is 46.

The spelling of 85719000781 in words is "eighty-five billion, seven hundred nineteen million, seven hundred eighty-one", and thus it is an aban number.