128305724 has 24 divisors (see below), whose sum is σ = 226820496. Its totient is φ = 63504000.

The previous prime is 128305721. The next prime is 128305729. The reversal of 128305724 is 427503821.

It is a super-2 number, since 2×128305724² = 32924717622328352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128305721) 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, 236894 + ... + 237434.

It is an arithmetic number, because the mean of its divisors is an integer number (9450854).

Almost surely, 2^128305724 is an apocalyptic number.

It is an amenable number.

128305724 is a deficient number, since it is larger than the sum of its proper divisors (98514772).

128305724 is a wasteful number, since it uses less digits than its factorization.

128305724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 128305724 is about 11327.2116604220. The cubic root of 128305724 is about 504.3693385407.

The spelling of 128305724 in words is "one hundred twenty-eight million, three hundred five thousand, seven hundred twenty-four".