128739502 has 8 divisors (see below), whose sum is σ = 198328536. Its totient is φ = 62629992.

The previous prime is 128739493. The next prime is 128739509. The reversal of 128739502 is 205937821.

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

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128739509) 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, 869788 + ... + 869935.

It is an arithmetic number, because the mean of its divisors is an integer number (24791067).

Almost surely, 2^128739502 is an apocalyptic number.

128739502 is a deficient number, since it is larger than the sum of its proper divisors (69589034).

128739502 is a wasteful number, since it uses less digits than its factorization.

128739502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739762.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 128739502 is about 11346.3431113289. The cubic root of 128739502 is about 504.9370924483.

The spelling of 128739502 in words is "one hundred twenty-eight million, seven hundred thirty-nine thousand, five hundred two".