87847989 has 8 divisors (see below), whose sum is σ = 121169760. Its totient is φ = 56545776.

The previous prime is 87847987. The next prime is 87848021. The reversal of 87847989 is 98974878.

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

It is not a de Polignac number, because 87847989 - 2¹ = 87847987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87847987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504787 + ... + 504960.

It is an arithmetic number, because the mean of its divisors is an integer number (15146220).

Almost surely, 2^87847989 is an apocalyptic number.

It is an amenable number.

87847989 is a deficient number, since it is larger than the sum of its proper divisors (33321771).

87847989 is a wasteful number, since it uses less digits than its factorization.

87847989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009779.

The product of its digits is 8128512, while the sum is 60.

The square root of 87847989 is about 9372.7258041618. The cubic root of 87847989 is about 444.5397572921.

The spelling of 87847989 in words is "eighty-seven million, eight hundred forty-seven thousand, nine hundred eighty-nine".