87643331 has 4 divisors (see below), whose sum is σ = 89681592. Its totient is φ = 85605072.

The previous prime is 87643321. The next prime is 87643337. The reversal of 87643331 is 13334678.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87643331 - 2¹⁴ = 87626947 is a prime.

It is a super-2 number, since 2×87643331² = 15362706937551122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87643291 and 87643300.

It is not an unprimeable number, because it can be changed into a prime (87643337) 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 3 ways as a sum of consecutive naturals, for example, 1019066 + ... + 1019151.

It is an arithmetic number, because the mean of its divisors is an integer number (22420398).

Almost surely, 2^87643331 is an apocalyptic number.

87643331 is a deficient number, since it is larger than the sum of its proper divisors (2038261).

87643331 is a wasteful number, since it uses less digits than its factorization.

87643331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038260.

The product of its digits is 36288, while the sum is 35.

The square root of 87643331 is about 9361.8016962548. The cubic root of 87643331 is about 444.1942765713.

The spelling of 87643331 in words is "eighty-seven million, six hundred forty-three thousand, three hundred thirty-one".