6939009640 has 24 divisors (see below), whose sum is σ = 15613957170. Its totient is φ = 2775393120.

The previous prime is 6939009533. The next prime is 6939009659. The reversal of 6939009640 is 469009396.

It can be written as a sum of positive squares in only one way, i.e., 6245108676 + 693900964 = 79026^2 + 26342^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 520255 + ... + 533425.

Almost surely, 2^6939009640 is an apocalyptic number.

It is an amenable number.

6939009640 is an abundant number, since it is smaller than the sum of its proper divisors (8674947530).

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

6939009640 is an frugal number, since it uses more digits than its factorization.

6939009640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26353 (or 13178 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 6939009640 is about 83300.7181241554. The cubic root of 6939009640 is about 1907.3592371852.

The spelling of 6939009640 in words is "six billion, nine hundred thirty-nine million, nine thousand, six hundred forty".