128040100 has 18 divisors (see below), whose sum is σ = 277847234. Its totient is φ = 51216000.

The previous prime is 128040071. The next prime is 128040109. The reversal of 128040100 is 1040821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 937024 + 127103076 = 968^2 + 11274^2 .

It is not an unprimeable number, because it can be changed into a prime (128040109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 640101 + ... + 640300.

Almost surely, 2^128040100 is an apocalyptic number.

128040100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128040100 is an abundant number, since it is smaller than the sum of its proper divisors (149807134).

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

128040100 is a wasteful number, since it uses less digits than its factorization.

128040100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280415 (or 1280408 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 128040100 is about 11315.4805465787. The cubic root of 128040100 is about 504.0210424153.

Adding to 128040100 its reverse (1040821), we get a palindrome (129080921).

The spelling of 128040100 in words is "one hundred twenty-eight million, forty thousand, one hundred".