87491836 has 6 divisors (see below), whose sum is σ = 153110720. Its totient is φ = 43745916.

The previous prime is 87491821. The next prime is 87491849. The reversal of 87491836 is 63819478.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936476 + ... + 10936483.

Almost surely, 2^87491836 is an apocalyptic number.

It is an amenable number.

87491836 is a deficient number, since it is larger than the sum of its proper divisors (65618884).

87491836 is a wasteful number, since it uses less digits than its factorization.

87491836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21872963 (or 21872961 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 87491836 is about 9353.7070725996. The cubic root of 87491836 is about 443.9381931118.

It can be divided in two parts, 8749 and 1836, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 87491836 in words is "eighty-seven million, four hundred ninety-one thousand, eight hundred thirty-six".