128889501 has 8 divisors (see below), whose sum is σ = 185072160. Its totient is φ = 79316592.

The previous prime is 128889499. The next prime is 128889503. The reversal of 128889501 is 105988821.

It is an interprime number because it is at equal distance from previous prime (128889499) and next prime (128889503).

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

It is not a de Polignac number, because 128889501 - 2¹ = 128889499 is a prime.

It is a super-2 number, since 2×128889501² = 33225006936058002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128889503) 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, 1652391 + ... + 1652468.

It is an arithmetic number, because the mean of its divisors is an integer number (23134020).

Almost surely, 2^128889501 is an apocalyptic number.

It is an amenable number.

128889501 is a deficient number, since it is larger than the sum of its proper divisors (56182659).

128889501 is a wasteful number, since it uses less digits than its factorization.

128889501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304875.

The product of its (nonzero) digits is 46080, while the sum is 42.

The square root of 128889501 is about 11352.9512022205. The cubic root of 128889501 is about 505.1331230914.

The spelling of 128889501 in words is "one hundred twenty-eight million, eight hundred eighty-nine thousand, five hundred one".