6445739000 has 32 divisors (see below), whose sum is σ = 15083031600. Its totient is φ = 2578295200.

The previous prime is 6445738903. The next prime is 6445739009. The reversal of 6445739000 is 9375446.

It is a super-2 number, since 2×6445739000² = 83095102512242000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445739009) 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, 3221870 + ... + 3223869.

Almost surely, 2^6445739000 is an apocalyptic number.

It is an amenable number.

6445739000 is an abundant number, since it is smaller than the sum of its proper divisors (8637292600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445739000 is a wasteful number, since it uses less digits than its factorization.

6445739000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445760 (or 6445746 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 6445739000 is about 80285.3598111138. The cubic root of 6445739000 is about 1861.0479892125.

The spelling of 6445739000 in words is "six billion, four hundred forty-five million, seven hundred thirty-nine thousand".