6404709428 has 12 divisors (see below), whose sum is σ = 12070414020. Its totient is φ = 2956019712.

The previous prime is 6404709427. The next prime is 6404709463. The reversal of 6404709428 is 8249074046.

It can be written as a sum of positive squares in 2 ways, for example, as 331312804 + 6073396624 = 18202^2 + 77932^2 .

It is a super-2 number, since 2×6404709428² = 82040605714224174368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404709427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61583693 + ... + 61583796.

It is an arithmetic number, because the mean of its divisors is an integer number (1005867835).

Almost surely, 2^6404709428 is an apocalyptic number.

It is an amenable number.

6404709428 is a deficient number, since it is larger than the sum of its proper divisors (5665704592).

6404709428 is a wasteful number, since it uses less digits than its factorization.

6404709428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123167506 (or 123167504 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 6404709428 is about 80029.4285122667. The cubic root of 6404709428 is about 1857.0908223809.

The spelling of 6404709428 in words is "six billion, four hundred four million, seven hundred nine thousand, four hundred twenty-eight".