1028658631 has 48 divisors (see below), whose sum is σ = 1406659072. Its totient is φ = 731903040.

The previous prime is 1028658583. The next prime is 1028658643. The reversal of 1028658631 is 1368568201.

1028658631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028658631 - 2¹¹ = 1028656583 is a prime.

It is a super-2 number, since 2×1028658631² = 2116277158261588322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028658671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1133680 + ... + 1134586.

Almost surely, 2^1028658631 is an apocalyptic number.

1028658631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1028658631 is a deficient number, since it is larger than the sum of its proper divisors (378000441).

1028658631 is a wasteful number, since it uses less digits than its factorization.

1028658631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1041 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1028658631 is about 32072.7085073899. The cubic root of 1028658631 is about 1009.4630453041.

The spelling of 1028658631 in words is "one billion, twenty-eight million, six hundred fifty-eight thousand, six hundred thirty-one".