128323720 has 64 divisors (see below), whose sum is σ = 347356800. Its totient is φ = 41679360.

The previous prime is 128323711. The next prime is 128323763. The reversal of 128323720 is 27323821.

It is a super-2 number, since 2×128323720² = 32933954229276800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6741 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (5427450).

Almost surely, 2^128323720 is an apocalyptic number.

128323720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128323720 is an abundant number, since it is smaller than the sum of its proper divisors (219033080).

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

128323720 is a wasteful number, since it uses less digits than its factorization.

128323720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24158 (or 24154 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 128323720 is about 11328.0060028233. The cubic root of 128323720 is about 504.3929181753.

The spelling of 128323720 in words is "one hundred twenty-eight million, three hundred twenty-three thousand, seven hundred twenty".