87690311 has 2 divisors, whose sum is σ = 87690312. Its totient is φ = 87690310.

The previous prime is 87690299. The next prime is 87690331. The reversal of 87690311 is 11309678.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87690311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87690331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43845155 + 43845156.

It is an arithmetic number, because the mean of its divisors is an integer number (43845156).

Almost surely, 2^87690311 is an apocalyptic number.

87690311 is a deficient number, since it is larger than the sum of its proper divisors (1).

87690311 is an equidigital number, since it uses as much as digits as its factorization.

87690311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 87690311 is about 9364.3104925029. The cubic root of 87690311 is about 444.2736304680.

Adding to 87690311 its reverse (11309678), we get a palindrome (98999989).

The spelling of 87690311 in words is "eighty-seven million, six hundred ninety thousand, three hundred eleven".