1028440531 has 16 divisors (see below), whose sum is σ = 1121817600. Its totient is φ = 939232800.

The previous prime is 1028440507. The next prime is 1028440537. The reversal of 1028440531 is 1350448201.

It is a cyclic number.

It is not a de Polignac number, because 1028440531 - 2⁵ = 1028440499 is a prime.

It is a super-2 number, since 2×1028440531² = 2115379851607123922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1028440531.

It is not an unprimeable number, because it can be changed into a prime (1028440537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155196 + ... + 161686.

It is an arithmetic number, because the mean of its divisors is an integer number (70113600).

Almost surely, 2^1028440531 is an apocalyptic number.

1028440531 is a deficient number, since it is larger than the sum of its proper divisors (93377069).

1028440531 is a wasteful number, since it uses less digits than its factorization.

1028440531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1028440531 is about 32069.3082401227. The cubic root of 1028440531 is about 1009.3916969010.

Adding to 1028440531 its reverse (1350448201), we get a palindrome (2378888732).

The spelling of 1028440531 in words is "one billion, twenty-eight million, four hundred forty thousand, five hundred thirty-one".