87664566 has 32 divisors (see below), whose sum is σ = 193176576. Its totient is φ = 26300000.

The previous prime is 87664553. The next prime is 87664567. The reversal of 87664566 is 66546678.

It is a super-2 number, since 2×87664566² = 15370152263936712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87664567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91 + ... + 13241.

It is an arithmetic number, because the mean of its divisors is an integer number (6036768).

Almost surely, 2^87664566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87664566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96588288).

87664566 is an abundant number, since it is smaller than the sum of its proper divisors (105512010).

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

87664566 is a wasteful number, since it uses less digits than its factorization.

87664566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13268.

The product of its digits is 1451520, while the sum is 48.

The square root of 87664566 is about 9362.9357575496. The cubic root of 87664566 is about 444.2301481113.

The spelling of 87664566 in words is "eighty-seven million, six hundred sixty-four thousand, five hundred sixty-six".