87627981 has 16 divisors (see below), whose sum is σ = 140556800. Its totient is φ = 47437488.

The previous prime is 87627977. The next prime is 87628003. The reversal of 87627981 is 18972678.

It is not a de Polignac number, because 87627981 - 2² = 87627977 is a prime.

It is a super-2 number, since 2×87627981² = 15357326108272722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87627981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87627941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109411 + ... + 110208.

It is an arithmetic number, because the mean of its divisors is an integer number (8784800).

Almost surely, 2^87627981 is an apocalyptic number.

It is an amenable number.

87627981 is a deficient number, since it is larger than the sum of its proper divisors (52928819).

87627981 is a wasteful number, since it uses less digits than its factorization.

87627981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219648.

The product of its digits is 338688, while the sum is 48.

The square root of 87627981 is about 9360.9818395294. The cubic root of 87627981 is about 444.1683427470.

The spelling of 87627981 in words is "eighty-seven million, six hundred twenty-seven thousand, nine hundred eighty-one".