6440309698 has 8 divisors (see below), whose sum is σ = 9660805308. Its totient is φ = 3220041264.

The previous prime is 6440309693. The next prime is 6440309713. The reversal of 6440309698 is 8969030446.

It can be written as a sum of positive squares in 2 ways, for example, as 6265197409 + 175112289 = 79153^2 + 13233^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6440309693) 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, 79440 + ... + 138532.

Almost surely, 2^6440309698 is an apocalyptic number.

6440309698 is a deficient number, since it is larger than the sum of its proper divisors (3220495610).

6440309698 is a wasteful number, since it uses less digits than its factorization.

6440309698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113588.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 6440309698 is about 80251.5401596754. The cubic root of 6440309698 is about 1860.5253168007.

The spelling of 6440309698 in words is "six billion, four hundred forty million, three hundred nine thousand, six hundred ninety-eight".