774728891 has 8 divisors (see below), whose sum is σ = 789426000. Its totient is φ = 760165120.

The previous prime is 774728873. The next prime is 774728909. The reversal of 774728891 is 198827477.

It is an interprime number because it is at equal distance from previous prime (774728873) and next prime (774728909).

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

It is a cyclic number.

It is not a de Polignac number, because 774728891 - 2²⁶ = 707620027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (774728861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21566 + ... + 44883.

It is an arithmetic number, because the mean of its divisors is an integer number (98678250).

Almost surely, 2^774728891 is an apocalyptic number.

774728891 is a deficient number, since it is larger than the sum of its proper divisors (14697109).

774728891 is a wasteful number, since it uses less digits than its factorization.

774728891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66669.

The product of its digits is 1580544, while the sum is 53.

The square root of 774728891 is about 27833.9521268540. The cubic root of 774728891 is about 918.4381546052.

The spelling of 774728891 in words is "seven hundred seventy-four million, seven hundred twenty-eight thousand, eight hundred ninety-one".