9231780640 has 48 divisors (see below), whose sum is σ = 23093034552. Its totient is φ = 3475492864.

The previous prime is 9231780637. The next prime is 9231780647. The reversal of 9231780640 is 460871329.

It can be written as a sum of positive squares in 4 ways, for example, as 6853852944 + 2377927696 = 82788^2 + 48764^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 9231780593 and 9231780602.

It is not an unprimeable number, because it can be changed into a prime (9231780647) 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, 1694299 + ... + 1699738.

Almost surely, 2^9231780640 is an apocalyptic number.

It is an amenable number.

9231780640 is an abundant number, since it is smaller than the sum of its proper divisors (13861253912).

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

9231780640 is a wasteful number, since it uses less digits than its factorization.

9231780640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394069 (or 3394061 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 9231780640 is about 96082.1556793976. The cubic root of 9231780640 is about 2097.7891047652.

The spelling of 9231780640 in words is "nine billion, two hundred thirty-one million, seven hundred eighty thousand, six hundred forty".