128237720 has 32 divisors (see below), whose sum is σ = 310731120. Its totient is φ = 47349120.

The previous prime is 128237717. The next prime is 128237729. The reversal of 128237720 is 27732821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128237729) 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 7 ways as a sum of consecutive naturals, for example, 122786 + ... + 123825.

Almost surely, 2^128237720 is an apocalyptic number.

128237720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128237720 is an abundant number, since it is smaller than the sum of its proper divisors (182493400).

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

128237720 is a wasteful number, since it uses less digits than its factorization.

128237720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246635 (or 246631 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 128237720 is about 11324.2094646823. The cubic root of 128237720 is about 504.2802149669.

The spelling of 128237720 in words is "one hundred twenty-eight million, two hundred thirty-seven thousand, seven hundred twenty".