87750981 has 12 divisors (see below), whose sum is σ = 126836320. Its totient is φ = 58461480.

The previous prime is 87750979. The next prime is 87750983. The reversal of 87750981 is 18905778.

It is an interprime number because it is at equal distance from previous prime (87750979) and next prime (87750983).

It is not a de Polignac number, because 87750981 - 2¹ = 87750979 is a prime.

It is a super-2 number, since 2×87750981² = 15400469332924722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87750983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18690 + ... + 22908.

Almost surely, 2^87750981 is an apocalyptic number.

It is an amenable number.

87750981 is a deficient number, since it is larger than the sum of its proper divisors (39085339).

87750981 is a wasteful number, since it uses less digits than its factorization.

87750981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536 (or 6533 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 87750981 is about 9367.5493593575. The cubic root of 87750981 is about 444.3760662143.

The spelling of 87750981 in words is "eighty-seven million, seven hundred fifty thousand, nine hundred eighty-one".