128405716 has 12 divisors (see below), whose sum is σ = 226351188. Its totient is φ = 63733952.

The previous prime is 128405713. The next prime is 128405737. The reversal of 128405716 is 617504821.

It can be written as a sum of positive squares in 2 ways, for example, as 84713616 + 43692100 = 9204^2 + 6610^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128405713) 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, 116611 + ... + 117706.

It is an arithmetic number, because the mean of its divisors is an integer number (18862599).

Almost surely, 2^128405716 is an apocalyptic number.

It is an amenable number.

128405716 is a deficient number, since it is larger than the sum of its proper divisors (97945472).

128405716 is a wasteful number, since it uses less digits than its factorization.

128405716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234458 (or 234456 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 128405716 is about 11331.6245966763. The cubic root of 128405716 is about 504.5003272495.

The spelling of 128405716 in words is "one hundred twenty-eight million, four hundred five thousand, seven hundred sixteen".