6400090987 has 2 divisors, whose sum is σ = 6400090988. Its totient is φ = 6400090986.

The previous prime is 6400090951. The next prime is 6400090993. The reversal of 6400090987 is 7890900046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6400090987 - 2⁷ = 6400090859 is a prime.

It is a super-2 number, since 2×6400090987² = 81922329283757268338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6400090187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200045493 + 3200045494.

It is an arithmetic number, because the mean of its divisors is an integer number (3200045494).

Almost surely, 2^6400090987 is an apocalyptic number.

6400090987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400090987 is an equidigital number, since it uses as much as digits as its factorization.

6400090987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 6400090987 is about 80000.5686667289. The cubic root of 6400090987 is about 1856.6443318252.

The spelling of 6400090987 in words is "six billion, four hundred million, ninety thousand, nine hundred eighty-seven".