87688031 has 2 divisors, whose sum is σ = 87688032. Its totient is φ = 87688030.

The previous prime is 87688019. The next prime is 87688037. The reversal of 87688031 is 13088678.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87688031 is a prime.

It is a super-2 number, since 2×87688031² = 15378381561313922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87688031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87688037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43844015 + 43844016.

It is an arithmetic number, because the mean of its divisors is an integer number (43844016).

Almost surely, 2^87688031 is an apocalyptic number.

87688031 is a deficient number, since it is larger than the sum of its proper divisors (1).

87688031 is an equidigital number, since it uses as much as digits as its factorization.

87688031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 87688031 is about 9364.1887529033. The cubic root of 87688031 is about 444.2697799755.

The spelling of 87688031 in words is "eighty-seven million, six hundred eighty-eight thousand, thirty-one".