1028591232 has 32 divisors (see below), whose sum is σ = 2732196480. Its totient is φ = 342863616.

The previous prime is 1028591209. The next prime is 1028591233. The reversal of 1028591232 is 2321958201.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-4 number, since 4×1028591232⁴ (a number of 37 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1028591193 and 1028591202.

It is not an unprimeable number, because it can be changed into a prime (1028591233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338928 + ... + 1339695.

It is an arithmetic number, because the mean of its divisors is an integer number (85381140).

Almost surely, 2^1028591232 is an apocalyptic number.

1028591232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1028591232 is an abundant number, since it is smaller than the sum of its proper divisors (1703605248).

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

1028591232 is an equidigital number, since it uses as much as digits as its factorization.

1028591232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678640 (or 2678628 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1028591232 is about 32071.6577681915. The cubic root of 1028591232 is about 1009.4409977288.

The spelling of 1028591232 in words is "one billion, twenty-eight million, five hundred ninety-one thousand, two hundred thirty-two".