85861640 has 32 divisors (see below), whose sum is σ = 193472280. Its totient is φ = 34294272.

The previous prime is 85861631. The next prime is 85861681. The reversal of 85861640 is 4616858.

It can be written as a sum of positive squares in 4 ways, for example, as 64866916 + 20994724 = 8054^2 + 4582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 85861594 and 85861603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38804 + ... + 40956.

Almost surely, 2^85861640 is an apocalyptic number.

It is an amenable number.

85861640 is an abundant number, since it is smaller than the sum of its proper divisors (107610640).

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

85861640 is a wasteful number, since it uses less digits than its factorization.

85861640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161 (or 3157 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 85861640 is about 9266.1556213998. The cubic root of 85861640 is about 441.1636553384.

The spelling of 85861640 in words is "eighty-five million, eight hundred sixty-one thousand, six hundred forty".