775905987 has 8 divisors (see below), whose sum is σ = 1036455760. Its totient is φ = 516313440.

The previous prime is 775905971. The next prime is 775905997. The reversal of 775905987 is 789509577.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 775905987 - 2⁴ = 775905971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775905997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237412 + ... + 240657.

It is an arithmetic number, because the mean of its divisors is an integer number (129556970).

Almost surely, 2^775905987 is an apocalyptic number.

775905987 is a deficient number, since it is larger than the sum of its proper divisors (260549773).

775905987 is a wasteful number, since it uses less digits than its factorization.

775905987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478613.

The product of its (nonzero) digits is 5556600, while the sum is 57.

The square root of 775905987 is about 27855.0890682475. The cubic root of 775905987 is about 918.9030668383.

The spelling of 775905987 in words is "seven hundred seventy-five million, nine hundred five thousand, nine hundred eighty-seven".