85121864 has 8 divisors (see below), whose sum is σ = 159603510. Its totient is φ = 42560928.

The previous prime is 85121849. The next prime is 85121879. The reversal of 85121864 is 46812158.

It is an interprime number because it is at equal distance from previous prime (85121849) and next prime (85121879).

It can be written as a sum of positive squares in only one way, i.e., 71740900 + 13380964 = 8470^2 + 3658^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5320109 + ... + 5320124.

Almost surely, 2^85121864 is an apocalyptic number.

It is an amenable number.

85121864 is a deficient number, since it is larger than the sum of its proper divisors (74481646).

85121864 is a wasteful number, since it uses less digits than its factorization.

85121864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10640239 (or 10640235 counting only the distinct ones).

The product of its digits is 15360, while the sum is 35.

The square root of 85121864 is about 9226.1510934951. The cubic root of 85121864 is about 439.8929905060.

The spelling of 85121864 in words is "eighty-five million, one hundred twenty-one thousand, eight hundred sixty-four".