126639680 has 28 divisors (see below), whose sum is σ = 301561500. Its totient is φ = 50655744.

The previous prime is 126639673. The next prime is 126639683. The reversal of 126639680 is 86936621.

It can be written as a sum of positive squares in 2 ways, for example, as 60964864 + 65674816 = 7808^2 + 8104^2 .

It is not an unprimeable number, because it can be changed into a prime (126639683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197555 + ... + 198194.

Almost surely, 2^126639680 is an apocalyptic number.

126639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126639680 is an abundant number, since it is smaller than the sum of its proper divisors (174921820).

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

126639680 is an equidigital number, since it uses as much as digits as its factorization.

126639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395766 (or 395756 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 126639680 is about 11253.4296994294. The cubic root of 126639680 is about 502.1767497689.

The spelling of 126639680 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, six hundred eighty".