87537818 has 4 divisors (see below), whose sum is σ = 131306730. Its totient is φ = 43768908.

The previous prime is 87537803. The next prime is 87537833. The reversal of 87537818 is 81873578.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (87537803) and next prime (87537833).

It can be written as a sum of positive squares in only one way, i.e., 48762289 + 38775529 = 6983^2 + 6227^2 .

It is a super-2 number, since 2×87537818² = 15325739160402248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21884453 + ... + 21884456.

Almost surely, 2^87537818 is an apocalyptic number.

87537818 is a deficient number, since it is larger than the sum of its proper divisors (43768912).

87537818 is a wasteful number, since it uses less digits than its factorization.

87537818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43768911.

The product of its digits is 376320, while the sum is 47.

The square root of 87537818 is about 9356.1647056900. The cubic root of 87537818 is about 444.0159511895.

The spelling of 87537818 in words is "eighty-seven million, five hundred thirty-seven thousand, eight hundred eighteen".