7940390672 has 40 divisors (see below), whose sum is σ = 15634430136. Its totient is φ = 3906215936.

The previous prime is 7940390657. The next prime is 7940390683. The reversal of 7940390672 is 2760930497.

It can be written as a sum of positive squares in 4 ways, for example, as 1698758656 + 6241632016 = 41216^2 + 79004^2 .

It is a super-3 number, since 3×7940390672³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 231668 + ... + 263724.

Almost surely, 2^7940390672 is an apocalyptic number.

It is an amenable number.

7940390672 is a deficient number, since it is larger than the sum of its proper divisors (7694039464).

7940390672 is a wasteful number, since it uses less digits than its factorization.

7940390672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32315 (or 32309 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 47.

The square root of 7940390672 is about 89108.8697717573. The cubic root of 7940390672 is about 1995.0201669224.

The spelling of 7940390672 in words is "seven billion, nine hundred forty million, three hundred ninety thousand, six hundred seventy-two".