1025404128 has 144 divisors (see below), whose sum is σ = 3351269376. Its totient is φ = 291329280.

The previous prime is 1025404111. The next prime is 1025404139. The reversal of 1025404128 is 8214045201.

1025404128 is a `hidden beast` number, since 102 + 540 + 4 + 12 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383725 + ... + 386387.

It is an arithmetic number, because the mean of its divisors is an integer number (23272704).

Almost surely, 2^1025404128 is an apocalyptic number.

1025404128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1025404128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675634688).

1025404128 is an abundant number, since it is smaller than the sum of its proper divisors (2325865248).

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

1025404128 is a wasteful number, since it uses less digits than its factorization.

1025404128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877 (or 2866 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 1025404128 is about 32021.9319841886. The cubic root of 1025404128 is about 1008.3973301336.

Adding to 1025404128 its reverse (8214045201), we get a palindrome (9239449329).

The spelling of 1025404128 in words is "one billion, twenty-five million, four hundred four thousand, one hundred twenty-eight".