128367828 has 30 divisors (see below), whose sum is σ = 335579706. Its totient is φ = 42789168.

The previous prime is 128367823. The next prime is 128367829. The reversal of 128367828 is 828763821.

It can be written as a sum of positive squares in only one way, i.e., 74960964 + 53406864 = 8658^2 + 7308^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128367823) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 197775 + ... + 198422.

Almost surely, 2^128367828 is an apocalyptic number.

128367828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128367828 is an abundant number, since it is smaller than the sum of its proper divisors (207211878).

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

128367828 is a wasteful number, since it uses less digits than its factorization.

128367828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396213 (or 396202 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 128367828 is about 11329.9526918695. The cubic root of 128367828 is about 504.4507022813.

The spelling of 128367828 in words is "one hundred twenty-eight million, three hundred sixty-seven thousand, eight hundred twenty-eight".