85878661 has 6 divisors (see below), whose sum is σ = 94395686. Its totient is φ = 78071400.

The previous prime is 85878623. The next prime is 85878671. The reversal of 85878661 is 16687858.

It can be written as a sum of positive squares in only one way, i.e., 83156161 + 2722500 = 9119^2 + 1650^2 .

It is not a de Polignac number, because 85878661 - 2²³ = 77490053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85878671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 354750 + ... + 354991.

Almost surely, 2^85878661 is an apocalyptic number.

It is an amenable number.

85878661 is a deficient number, since it is larger than the sum of its proper divisors (8517025).

85878661 is a wasteful number, since it uses less digits than its factorization.

85878661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709763 (or 709752 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 85878661 is about 9267.0740258185. The cubic root of 85878661 is about 441.1928051444.

The spelling of 85878661 in words is "eighty-five million, eight hundred seventy-eight thousand, six hundred sixty-one".