664029828 has 144 divisors (see below), whose sum is σ = 2101357440. Its totient is φ = 171763200.

The previous prime is 664029811. The next prime is 664029833. The reversal of 664029828 is 828920466.

It is a super-2 number, since 2×664029828² = 881871224947419168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1166728 + ... + 1167296.

It is an arithmetic number, because the mean of its divisors is an integer number (14592760).

Almost surely, 2^664029828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664029828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050678720).

664029828 is an abundant number, since it is smaller than the sum of its proper divisors (1437327612).

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

664029828 is a wasteful number, since it uses less digits than its factorization.

664029828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 664029828 is about 25768.7762223975. The cubic root of 664029828 is about 872.4271975335.

The spelling of 664029828 in words is "six hundred sixty-four million, twenty-nine thousand, eight hundred twenty-eight".