87231440989 has 16 divisors (see below), whose sum is σ = 108852520320. Its totient is φ = 67912277760.

The previous prime is 87231440983. The next prime is 87231441007. The reversal of 87231440989 is 98904413278.

It is a cyclic number.

It is not a de Polignac number, because 87231440989 - 2¹⁵ = 87231408221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87231440983) 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, 414784 + ... + 588649.

It is an arithmetic number, because the mean of its divisors is an integer number (6803282520).

Almost surely, 2^87231440989 is an apocalyptic number.

It is an amenable number.

87231440989 is a deficient number, since it is larger than the sum of its proper divisors (21621079331).

87231440989 is a wasteful number, since it uses less digits than its factorization.

87231440989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004580.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 87231440989 in words is "eighty-seven billion, two hundred thirty-one million, four hundred forty thousand, nine hundred eighty-nine".