7981432720 has 40 divisors (see below), whose sum is σ = 18780422976. Its totient is φ = 3154105728.

The previous prime is 7981432717. The next prime is 7981432727. The reversal of 7981432720 is 272341897.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (7981432727) 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, 594372 + ... + 607651.

Almost surely, 2^7981432720 is an apocalyptic number.

It is an amenable number.

7981432720 is an abundant number, since it is smaller than the sum of its proper divisors (10798990256).

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

7981432720 is a wasteful number, since it uses less digits than its factorization.

7981432720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202119 (or 1202113 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 7981432720 is about 89338.8645551308. The cubic root of 7981432720 is about 1998.4515280934.

The spelling of 7981432720 in words is "seven billion, nine hundred eighty-one million, four hundred thirty-two thousand, seven hundred twenty".