87744533 has 4 divisors (see below), whose sum is σ = 87996300. Its totient is φ = 87492768.

The previous prime is 87744511. The next prime is 87744541. The reversal of 87744533 is 33544778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33544778 = 2 ⋅16772389.

It can be written as a sum of positive squares in 2 ways, for example, as 64915249 + 22829284 = 8057^2 + 4778^2 .

It is a cyclic number.

It is not a de Polignac number, because 87744533 - 2⁸ = 87744277 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 (87744583) 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, 125360 + ... + 126057.

It is an arithmetic number, because the mean of its divisors is an integer number (21999075).

Almost surely, 2^87744533 is an apocalyptic number.

It is an amenable number.

87744533 is a deficient number, since it is larger than the sum of its proper divisors (251767).

87744533 is a wasteful number, since it uses less digits than its factorization.

87744533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251766.

The product of its digits is 282240, while the sum is 41.

The square root of 87744533 is about 9367.2051861801. The cubic root of 87744533 is about 444.3651815988.

The spelling of 87744533 in words is "eighty-seven million, seven hundred forty-four thousand, five hundred thirty-three".