1028131404 has 96 divisors (see below), whose sum is σ = 2509678080. Its totient is φ = 327398400.

The previous prime is 1028131381. The next prime is 1028131409. The reversal of 1028131404 is 4041318201.

It is a super-2 number, since 2×1028131404² = 2114108367782022432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1028131409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5680194 + ... + 5680374.

It is an arithmetic number, because the mean of its divisors is an integer number (26142480).

Almost surely, 2^1028131404 is an apocalyptic number.

It is an amenable number.

1028131404 is an abundant number, since it is smaller than the sum of its proper divisors (1481546676).

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

1028131404 is a wasteful number, since it uses less digits than its factorization.

1028131404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1028131404 is about 32064.4882073611. The cubic root of 1028131404 is about 1009.2905529891.

Adding to 1028131404 its reverse (4041318201), we get a palindrome (5069449605).

The spelling of 1028131404 in words is "one billion, twenty-eight million, one hundred thirty-one thousand, four hundred four".