6404767739 has 4 divisors (see below), whose sum is σ = 6404927856. Its totient is φ = 6404607624.

The previous prime is 6404767729. The next prime is 6404767757. The reversal of 6404767739 is 9377674046.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6404767739 - 2¹⁶ = 6404702203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6404767709) 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, 36842 + ... + 119024.

It is an arithmetic number, because the mean of its divisors is an integer number (1601231964).

Almost surely, 2^6404767739 is an apocalyptic number.

6404767739 is a deficient number, since it is larger than the sum of its proper divisors (160117).

6404767739 is an equidigital number, since it uses as much as digits as its factorization.

6404767739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160116.

The product of its (nonzero) digits is 5334336, while the sum is 53.

The square root of 6404767739 is about 80029.7928211738. The cubic root of 6404767739 is about 1857.0964582595.

The spelling of 6404767739 in words is "six billion, four hundred four million, seven hundred sixty-seven thousand, seven hundred thirty-nine".