774631987 has 4 divisors (see below), whose sum is σ = 778959720. Its totient is φ = 770304256.

The previous prime is 774631961. The next prime is 774632017. The reversal of 774631987 is 789136477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789136477 = 4909 ⋅160753.

It is a cyclic number.

It is not a de Polignac number, because 774631987 - 2⁷ = 774631859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (774631787) 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 3 ways as a sum of consecutive naturals, for example, 2163598 + ... + 2163955.

It is an arithmetic number, because the mean of its divisors is an integer number (194739930).

Almost surely, 2^774631987 is an apocalyptic number.

774631987 is a deficient number, since it is larger than the sum of its proper divisors (4327733).

774631987 is a wasteful number, since it uses less digits than its factorization.

774631987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4327732.

The product of its digits is 1778112, while the sum is 52.

The square root of 774631987 is about 27832.2113206982. The cubic root of 774631987 is about 918.3998599006.

The spelling of 774631987 in words is "seven hundred seventy-four million, six hundred thirty-one thousand, nine hundred eighty-seven".