1028589723 has 18 divisors (see below), whose sum is σ = 1728311364. Its totient is φ = 587765304.

The previous prime is 1028589707. The next prime is 1028589733. The reversal of 1028589723 is 3279858201.

It is a happy number.

It is not a de Polignac number, because 1028589723 - 2⁴ = 1028589707 is a prime.

It is a super-2 number, since 2×1028589723² = 2115993636522433458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1028589733) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1165761 + ... + 1166642.

It is an arithmetic number, because the mean of its divisors is an integer number (96017298).

Almost surely, 2^1028589723 is an apocalyptic number.

1028589723 is a deficient number, since it is larger than the sum of its proper divisors (699721641).

1028589723 is a wasteful number, since it uses less digits than its factorization.

1028589723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332423 (or 2332413 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1028589723 is about 32071.6342427386. The cubic root of 1028589723 is about 1009.4405040934.

The spelling of 1028589723 in words is "one billion, twenty-eight million, five hundred eighty-nine thousand, seven hundred twenty-three".