528744640 has 56 divisors (see below), whose sum is σ = 1263335040. Its totient is φ = 210782208.

The previous prime is 528744613. The next prime is 528744647. The reversal of 528744640 is 46447825.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 528744593 and 528744602.

It is not an unprimeable number, because it can be changed into a prime (528744647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97521 + ... + 102799.

Almost surely, 2^528744640 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 528744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631667520).

528744640 is an abundant number, since it is smaller than the sum of its proper divisors (734590400).

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

528744640 is a wasteful number, since it uses less digits than its factorization.

528744640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5609 (or 5599 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The square root of 528744640 is about 22994.4480255561. The cubic root of 528744640 is about 808.6277838487.

The spelling of 528744640 in words is "five hundred twenty-eight million, seven hundred forty-four thousand, six hundred forty".