128709516 has 48 divisors (see below), whose sum is σ = 342455904. Its totient is φ = 37272576.

The previous prime is 128709509. The next prime is 128709523. The reversal of 128709516 is 615907821.

It is an interprime number because it is at equal distance from previous prime (128709509) and next prime (128709523).

It is a super-2 number, since 2×128709516² = 33132279017908512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21615 + ... + 26918.

It is an arithmetic number, because the mean of its divisors is an integer number (7134498).

Almost surely, 2^128709516 is an apocalyptic number.

It is an amenable number.

128709516 is an abundant number, since it is smaller than the sum of its proper divisors (213746388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128709516 is a wasteful number, since it uses less digits than its factorization.

128709516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48570 (or 48568 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 128709516 is about 11345.0216394681. The cubic root of 128709516 is about 504.8978860945.

The spelling of 128709516 in words is "one hundred twenty-eight million, seven hundred nine thousand, five hundred sixteen".