1028609764 has 72 divisors (see below), whose sum is σ = 2373826560. Its totient is φ = 385487424.

The previous prime is 1028609761. The next prime is 1028609801. The reversal of 1028609764 is 4679068201.

It is a super-2 number, since 2×1028609764² = 2116076093192271392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1028609764.

It is not an unprimeable number, because it can be changed into a prime (1028609761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37789 + ... + 59035.

Almost surely, 2^1028609764 is an apocalyptic number.

1028609764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028609764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1186913280).

1028609764 is an abundant number, since it is smaller than the sum of its proper divisors (1345216796).

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

1028609764 is a wasteful number, since it uses less digits than its factorization.

1028609764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21297 (or 21288 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1028609764 is about 32071.9466824201. The cubic root of 1028609764 is about 1009.4470600166.

The spelling of 1028609764 in words is "one billion, twenty-eight million, six hundred nine thousand, seven hundred sixty-four".