7940008640 has 56 divisors (see below), whose sum is σ = 18932194800. Its totient is φ = 3171795968.

The previous prime is 7940008639. The next prime is 7940008651. The reversal of 7940008640 is 468000497.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7940008594 and 7940008603.

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, 231311 + ... + 263409.

Almost surely, 2^7940008640 is an apocalyptic number.

It is an amenable number.

7940008640 is an abundant number, since it is smaller than the sum of its proper divisors (10992186160).

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

7940008640 is a wasteful number, since it uses less digits than its factorization.

7940008640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32889 (or 32879 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 7940008640 is about 89106.7261209837. The cubic root of 7940008640 is about 1994.9881712772.

The spelling of 7940008640 in words is "seven billion, nine hundred forty million, eight thousand, six hundred forty".