87056981 has 8 divisors (see below), whose sum is σ = 97288128. Its totient is φ = 77212000.

The previous prime is 87056969. The next prime is 87056987. The reversal of 87056981 is 18965078.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87056981 - 2¹⁰ = 87055957 is a prime.

It is a super-2 number, since 2×87056981² = 15157835881668722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87056987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96065 + ... + 96966.

It is an arithmetic number, because the mean of its divisors is an integer number (12161016).

Almost surely, 2^87056981 is an apocalyptic number.

It is an amenable number.

87056981 is a deficient number, since it is larger than the sum of its proper divisors (10231147).

87056981 is a wasteful number, since it uses less digits than its factorization.

87056981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193083.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 87056981 is about 9330.4330553303. The cubic root of 87056981 is about 443.2014788063.

The spelling of 87056981 in words is "eighty-seven million, fifty-six thousand, nine hundred eighty-one".