87205864 has 8 divisors (see below), whose sum is σ = 163511010. Its totient is φ = 43602928.

The previous prime is 87205861. The next prime is 87205907. The reversal of 87205864 is 46850278.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 25583364 = 7850^2 + 5058^2 .

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

It is not an unprimeable number, because it can be changed into a prime (87205861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5450359 + ... + 5450374.

Almost surely, 2^87205864 is an apocalyptic number.

It is an amenable number.

87205864 is a deficient number, since it is larger than the sum of its proper divisors (76305146).

87205864 is a wasteful number, since it uses less digits than its factorization.

87205864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10900739 (or 10900735 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 87205864 is about 9338.4080013673. The cubic root of 87205864 is about 443.4539861689.

The spelling of 87205864 in words is "eighty-seven million, two hundred five thousand, eight hundred sixty-four".