128833649 has 8 divisors (see below), whose sum is σ = 153640320. Its totient is φ = 105627456.

The previous prime is 128833609. The next prime is 128833657. The reversal of 128833649 is 946338821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128833649 is a prime.

It is a super-2 number, since 2×128833649² = 33196218229310402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128833609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399944 + ... + 400265.

It is an arithmetic number, because the mean of its divisors is an integer number (19205040).

Almost surely, 2^128833649 is an apocalyptic number.

It is an amenable number.

128833649 is a deficient number, since it is larger than the sum of its proper divisors (24806671).

128833649 is an equidigital number, since it uses as much as digits as its factorization.

128833649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800239.

The product of its digits is 248832, while the sum is 44.

The square root of 128833649 is about 11350.4911347483. The cubic root of 128833649 is about 505.0601490294.

The spelling of 128833649 in words is "one hundred twenty-eight million, eight hundred thirty-three thousand, six hundred forty-nine".