87144987 has 12 divisors (see below), whose sum is σ = 117180456. Its totient is φ = 57607200.

The previous prime is 87144983. The next prime is 87144997. The reversal of 87144987 is 78944178.

It is not a de Polignac number, because 87144987 - 2² = 87144983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87144983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47487 + ... + 49287.

It is an arithmetic number, because the mean of its divisors is an integer number (9765038).

Almost surely, 2^87144987 is an apocalyptic number.

87144987 is a deficient number, since it is larger than the sum of its proper divisors (30035469).

87144987 is a wasteful number, since it uses less digits than its factorization.

87144987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 1931 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 87144987 is about 9335.1479366960. The cubic root of 87144987 is about 443.3507728016.

The spelling of 87144987 in words is "eighty-seven million, one hundred forty-four thousand, nine hundred eighty-seven".