87643888 has 10 divisors (see below), whose sum is σ = 169810064. Its totient is φ = 43821936.

The previous prime is 87643867. The next prime is 87643889. The reversal of 87643888 is 88834678.

It is a super-2 number, since 2×87643888² = 15362902207513088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87643889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2738856 + ... + 2738887.

Almost surely, 2^87643888 is an apocalyptic number.

It is an amenable number.

87643888 is a deficient number, since it is larger than the sum of its proper divisors (82166176).

87643888 is a wasteful number, since it uses less digits than its factorization.

87643888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5477751 (or 5477745 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 52.

The square root of 87643888 is about 9361.8314447548. The cubic root of 87643888 is about 444.1952175658.

The spelling of 87643888 in words is "eighty-seven million, six hundred forty-three thousand, eight hundred eighty-eight".