128143764 has 72 divisors (see below), whose sum is σ = 386305920. Its totient is φ = 35019072.

The previous prime is 128143759. The next prime is 128143781. The reversal of 128143764 is 467341821.

128143764 is a `hidden beast` number, since 1 + 281 + 4 + 376 + 4 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5259 + ... + 16850.

It is an arithmetic number, because the mean of its divisors is an integer number (5365360).

Almost surely, 2^128143764 is an apocalyptic number.

128143764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128143764 is an abundant number, since it is smaller than the sum of its proper divisors (258162156).

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

128143764 is a wasteful number, since it uses less digits than its factorization.

128143764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22149 (or 22144 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 128143764 is about 11320.0602471895. The cubic root of 128143764 is about 504.1570277904.

The spelling of 128143764 in words is "one hundred twenty-eight million, one hundred forty-three thousand, seven hundred sixty-four".