6899497940 has 24 divisors (see below), whose sum is σ = 15341237352. Its totient is φ = 2597457920.

The previous prime is 6899497931. The next prime is 6899497973. The reversal of 6899497940 is 497949986.

It can be written as a sum of positive squares in 4 ways, for example, as 3525746884 + 3373751056 = 59378^2 + 58084^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10145981 + ... + 10146660.

It is an arithmetic number, because the mean of its divisors is an integer number (639218223).

Almost surely, 2^6899497940 is an apocalyptic number.

It is an amenable number.

6899497940 is an abundant number, since it is smaller than the sum of its proper divisors (8441739412).

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

6899497940 is a wasteful number, since it uses less digits than its factorization.

6899497940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20292667 (or 20292665 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 65.

The square root of 6899497940 is about 83063.2165281360. The cubic root of 6899497940 is about 1903.7320864030.

The spelling of 6899497940 in words is "six billion, eight hundred ninety-nine million, four hundred ninety-seven thousand, nine hundred forty".