126728805 has 16 divisors (see below), whose sum is σ = 231732864. Its totient is φ = 57933120.

The previous prime is 126728801. The next prime is 126728813. The reversal of 126728805 is 508827621.

It is not a de Polignac number, because 126728805 - 2² = 126728801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126728801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603366 + ... + 603575.

It is an arithmetic number, because the mean of its divisors is an integer number (14483304).

Almost surely, 2^126728805 is an apocalyptic number.

126728805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126728805 is a deficient number, since it is larger than the sum of its proper divisors (105004059).

126728805 is a wasteful number, since it uses less digits than its factorization.

126728805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206956.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 126728805 is about 11257.3889068469. The cubic root of 126728805 is about 502.2945275132.

The spelling of 126728805 in words is "one hundred twenty-six million, seven hundred twenty-eight thousand, eight hundred five".