128661364 has 24 divisors (see below), whose sum is σ = 243008640. Its totient is φ = 59252064.

The previous prime is 128661353. The next prime is 128661367. The reversal of 128661364 is 463166821.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128661367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23697 + ... + 28615.

It is an arithmetic number, because the mean of its divisors is an integer number (10125360).

Almost surely, 2^128661364 is an apocalyptic number.

It is an amenable number.

128661364 is a deficient number, since it is larger than the sum of its proper divisors (114347276).

128661364 is a wasteful number, since it uses less digits than its factorization.

128661364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439 (or 5437 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 128661364 is about 11342.8992766400. The cubic root of 128661364 is about 504.8349151602.

The spelling of 128661364 in words is "one hundred twenty-eight million, six hundred sixty-one thousand, three hundred sixty-four".