87440681 has 2 divisors, whose sum is σ = 87440682. Its totient is φ = 87440680.

The previous prime is 87440671. The next prime is 87440693. The reversal of 87440681 is 18604478.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 22477081 = 8060^2 + 4741^2 .

It is a cyclic number.

It is not a de Polignac number, because 87440681 - 2¹⁴ = 87424297 is a prime.

It is a super-2 number, since 2×87440681² = 15291745387487522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87440611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43720340 + 43720341.

It is an arithmetic number, because the mean of its divisors is an integer number (43720341).

Almost surely, 2^87440681 is an apocalyptic number.

It is an amenable number.

87440681 is a deficient number, since it is larger than the sum of its proper divisors (1).

87440681 is an equidigital number, since it uses as much as digits as its factorization.

87440681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 87440681 is about 9350.9721954458. The cubic root of 87440681 is about 443.8516551873.

The spelling of 87440681 in words is "eighty-seven million, four hundred forty thousand, six hundred eighty-one".