126520640 has 28 divisors (see below), whose sum is σ = 301278036. Its totient is φ = 50608128.

The previous prime is 126520637. The next prime is 126520643. The reversal of 126520640 is 46025621.

It is an interprime number because it is at equal distance from previous prime (126520637) and next prime (126520643).

It can be written as a sum of positive squares in 2 ways, for example, as 44943616 + 81577024 = 6704^2 + 9032^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126520643) 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 in 3 ways as a sum of consecutive naturals, for example, 197369 + ... + 198008.

Almost surely, 2^126520640 is an apocalyptic number.

126520640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126520640 is an abundant number, since it is smaller than the sum of its proper divisors (174757396).

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

126520640 is an equidigital number, since it uses as much as digits as its factorization.

126520640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395394 (or 395384 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 126520640 is about 11248.1394016966. The cubic root of 126520640 is about 502.0193534440.

The spelling of 126520640 in words is "one hundred twenty-six million, five hundred twenty thousand, six hundred forty".