85111640 has 64 divisors (see below), whose sum is σ = 205480800. Its totient is φ = 31629312.

The previous prime is 85111633. The next prime is 85111657. The reversal of 85111640 is 4611158.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39224 + ... + 41336.

Almost surely, 2^85111640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85111640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102740400).

85111640 is an abundant number, since it is smaller than the sum of its proper divisors (120369160).

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

85111640 is a wasteful number, since it uses less digits than its factorization.

85111640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 85111640 is about 9225.5969996527. The cubic root of 85111640 is about 439.8753779295.

Adding to 85111640 its reverse (4611158), we get a palindrome (89722798).

The spelling of 85111640 in words is "eighty-five million, one hundred eleven thousand, six hundred forty".