87205657 has 8 divisors (see below), whose sum is σ = 108724032. Its totient is φ = 67952400.

The previous prime is 87205607. The next prime is 87205669. The reversal of 87205657 is 75650278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87205657 is a prime.

It is a super-2 number, since 2×87205657² = 15209653225603298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87205607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 566194 + ... + 566347.

It is an arithmetic number, because the mean of its divisors is an integer number (13590504).

Almost surely, 2^87205657 is an apocalyptic number.

It is an amenable number.

87205657 is a deficient number, since it is larger than the sum of its proper divisors (21518375).

87205657 is a wasteful number, since it uses less digits than its factorization.

87205657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132559.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 87205657 is about 9338.3969181011. The cubic root of 87205657 is about 443.4536352940.

The spelling of 87205657 in words is "eighty-seven million, two hundred five thousand, six hundred fifty-seven".