126640784 has 10 divisors (see below), whose sum is σ = 245366550. Its totient is φ = 63320384.

The previous prime is 126640781. The next prime is 126640793. The reversal of 126640784 is 487046621.

It can be written as a sum of positive squares in only one way, i.e., 70090384 + 56550400 = 8372^2 + 7520^2 .

It is not an unprimeable number, because it can be changed into a prime (126640781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3957509 + ... + 3957540.

It is an arithmetic number, because the mean of its divisors is an integer number (24536655).

Almost surely, 2^126640784 is an apocalyptic number.

It is an amenable number.

126640784 is a deficient number, since it is larger than the sum of its proper divisors (118725766).

126640784 is an equidigital number, since it uses as much as digits as its factorization.

126640784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7915057 (or 7915051 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 126640784 is about 11253.4787510352. The cubic root of 126640784 is about 502.1782090312.

The spelling of 126640784 in words is "one hundred twenty-six million, six hundred forty thousand, seven hundred eighty-four".