128723630 has 16 divisors (see below), whose sum is σ = 264803040. Its totient is φ = 44133792.

The previous prime is 128723599. The next prime is 128723657. The reversal of 128723630 is 36327821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919385 + ... + 919524.

It is an arithmetic number, because the mean of its divisors is an integer number (16550190).

Almost surely, 2^128723630 is an apocalyptic number.

128723630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128723630 is an abundant number, since it is smaller than the sum of its proper divisors (136079410).

128723630 is a wasteful number, since it uses less digits than its factorization.

128723630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838923.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 128723630 is about 11345.6436573691. The cubic root of 128723630 is about 504.9163407474.

The spelling of 128723630 in words is "one hundred twenty-eight million, seven hundred twenty-three thousand, six hundred thirty".