104128440 has 64 divisors (see below), whose sum is σ = 336420000. Its totient is φ = 25631232.

The previous prime is 104128439. The next prime is 104128457. The reversal of 104128440 is 44821401.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 104128440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31815 + ... + 34934.

Almost surely, 2^104128440 is an apocalyptic number.

104128440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

104128440 is an abundant number, since it is smaller than the sum of its proper divisors (232291560).

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

104128440 is a wasteful number, since it uses less digits than its factorization.

104128440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66776 (or 66772 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 104128440 is about 10204.3343731965. The cubic root of 104128440 is about 470.4604511255.

Adding to 104128440 its reverse (44821401), we get a palindrome (148949841).

The spelling of 104128440 in words is "one hundred four million, one hundred twenty-eight thousand, four hundred forty".