87917138 has 4 divisors (see below), whose sum is σ = 131875710. Its totient is φ = 43958568.

The previous prime is 87917129. The next prime is 87917173. The reversal of 87917138 is 83171978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83171978 = 2 ⋅41585989.

It can be written as a sum of positive squares in only one way, i.e., 87853129 + 64009 = 9373^2 + 253^2 .

It is a super-2 number, since 2×87917138² = 15458846308222088, 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, 21979283 + ... + 21979286.

Almost surely, 2^87917138 is an apocalyptic number.

87917138 is a deficient number, since it is larger than the sum of its proper divisors (43958572).

87917138 is a wasteful number, since it uses less digits than its factorization.

87917138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43958571.

The product of its digits is 84672, while the sum is 44.

The square root of 87917138 is about 9376.4139200443. The cubic root of 87917138 is about 444.6563656064.

The spelling of 87917138 in words is "eighty-seven million, nine hundred seventeen thousand, one hundred thirty-eight".