128500646 has 8 divisors (see below), whose sum is σ = 193277280. Its totient is φ = 64074888.

The previous prime is 128500639. The next prime is 128500649. The reversal of 128500646 is 646005821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128500649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86801 + ... + 88268.

It is an arithmetic number, because the mean of its divisors is an integer number (24159660).

Almost surely, 2^128500646 is an apocalyptic number.

128500646 is a deficient number, since it is larger than the sum of its proper divisors (64776634).

128500646 is a wasteful number, since it uses less digits than its factorization.

128500646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175438.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 128500646 is about 11335.8125425573. The cubic root of 128500646 is about 504.6246218686.

The spelling of 128500646 in words is "one hundred twenty-eight million, five hundred thousand, six hundred forty-six".