128720046 has 32 divisors (see below), whose sum is σ = 316850688. Its totient is φ = 33948000.

The previous prime is 128720023. The next prime is 128720047. The reversal of 128720046 is 640027821.

It is a junction number, because it is equal to n+sod(n) for n = 128719995 and 128720022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128720047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117330 + ... + 118421.

It is an arithmetic number, because the mean of its divisors is an integer number (9901584).

Almost surely, 2^128720046 is an apocalyptic number.

128720046 is an abundant number, since it is smaller than the sum of its proper divisors (188130642).

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

128720046 is a wasteful number, since it uses less digits than its factorization.

128720046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235776.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 128720046 is about 11345.4857101845. The cubic root of 128720046 is about 504.9116546434.

Adding to 128720046 its reverse (640027821), we get a palindrome (768747867).

The spelling of 128720046 in words is "one hundred twenty-eight million, seven hundred twenty thousand, forty-six".