87664399 has 2 divisors, whose sum is σ = 87664400. Its totient is φ = 87664398.

The previous prime is 87664397. The next prime is 87664439. The reversal of 87664399 is 99346678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87664399 - 2¹ = 87664397 is a prime.

Together with 87664397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87664391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43832199 + 43832200.

It is an arithmetic number, because the mean of its divisors is an integer number (43832200).

Almost surely, 2^87664399 is an apocalyptic number.

87664399 is a deficient number, since it is larger than the sum of its proper divisors (1).

87664399 is an equidigital number, since it uses as much as digits as its factorization.

87664399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 52.

The square root of 87664399 is about 9362.9268394023. The cubic root of 87664399 is about 444.2298660267.

The spelling of 87664399 in words is "eighty-seven million, six hundred sixty-four thousand, three hundred ninety-nine".