128423730 has 32 divisors (see below), whose sum is σ = 309049344. Its totient is φ = 34153856.

The previous prime is 128423681. The next prime is 128423741. The reversal of 128423730 is 37324821.

It is a super-2 number, since 2×128423730² = 32985308854225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 5902 + ... + 17078.

It is an arithmetic number, because the mean of its divisors is an integer number (9657792).

Almost surely, 2^128423730 is an apocalyptic number.

128423730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128423730 is an abundant number, since it is smaller than the sum of its proper divisors (180625614).

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

128423730 is a wasteful number, since it uses less digits than its factorization.

128423730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11570.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 128423730 is about 11332.4194239359. The cubic root of 128423730 is about 504.5239182136.

The spelling of 128423730 in words is "one hundred twenty-eight million, four hundred twenty-three thousand, seven hundred thirty".