8432640756 has 60 divisors (see below), whose sum is σ = 22064685412. Its totient is φ = 2808317952.

The previous prime is 8432640731. The next prime is 8432640757. The reversal of 8432640756 is 6570462348.

It can be written as a sum of positive squares in 2 ways, for example, as 3214890000 + 5217750756 = 56700^2 + 72234^2 .

It is a super-2 number, since 2×8432640756² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8432640757) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 362286 + ... + 384858.

Almost surely, 2^8432640756 is an apocalyptic number.

It is an amenable number.

8432640756 is an abundant number, since it is smaller than the sum of its proper divisors (13632044656).

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

8432640756 is a wasteful number, since it uses less digits than its factorization.

8432640756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23742 (or 23731 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The square root of 8432640756 is about 91829.4111709315. The cubic root of 8432640756 is about 2035.4223220635.

The spelling of 8432640756 in words is "eight billion, four hundred thirty-two million, six hundred forty thousand, seven hundred fifty-six".