128666400 has 72 divisors (see below), whose sum is σ = 418816944. Its totient is φ = 34310400.

The previous prime is 128666371. The next prime is 128666437. The reversal of 128666400 is 4666821.

It is a happy 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 11 ways as a sum of consecutive naturals, for example, 24406 + ... + 29205.

It is an arithmetic number, because the mean of its divisors is an integer number (5816902).

Almost surely, 2^128666400 is an apocalyptic number.

128666400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128666400 is an abundant number, since it is smaller than the sum of its proper divisors (290150544).

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

128666400 is a wasteful number, since it uses less digits than its factorization.

128666400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53634 (or 53621 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 128666400 is about 11343.1212635676. The cubic root of 128666400 is about 504.8415017411.

The spelling of 128666400 in words is "one hundred twenty-eight million, six hundred sixty-six thousand, four hundred".