128493920 has 24 divisors (see below), whose sum is σ = 303567264. Its totient is φ = 51397504.

The previous prime is 128493919. The next prime is 128493931. The reversal of 128493920 is 29394821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401384 + ... + 401703.

It is an arithmetic number, because the mean of its divisors is an integer number (12648636).

Almost surely, 2^128493920 is an apocalyptic number.

128493920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128493920 is an abundant number, since it is smaller than the sum of its proper divisors (175073344).

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

128493920 is an equidigital number, since it uses as much as digits as its factorization.

128493920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803102 (or 803094 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 128493920 is about 11335.5158682788. The cubic root of 128493920 is about 504.6158173359.

Subtracting from 128493920 its reverse (29394821), we obtain a palindrome (99099099).

The spelling of 128493920 in words is "one hundred twenty-eight million, four hundred ninety-three thousand, nine hundred twenty".