87448989 has 4 divisors (see below), whose sum is σ = 116598656. Its totient is φ = 58299324.

The previous prime is 87448979. The next prime is 87449027. The reversal of 87448989 is 98984478.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87448989 - 2⁴ = 87448973 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 (87448909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14574829 + ... + 14574834.

It is an arithmetic number, because the mean of its divisors is an integer number (29149664).

Almost surely, 2^87448989 is an apocalyptic number.

It is an amenable number.

87448989 is a deficient number, since it is larger than the sum of its proper divisors (29149667).

87448989 is a wasteful number, since it uses less digits than its factorization.

87448989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29149666.

The product of its digits is 4644864, while the sum is 57.

The square root of 87448989 is about 9351.4164167788. The cubic root of 87448989 is about 443.8657119655.

The spelling of 87448989 in words is "eighty-seven million, four hundred forty-eight thousand, nine hundred eighty-nine".