720521250 has 80 divisors (see below), whose sum is σ = 1809920640. Its totient is φ = 191160000.

The previous prime is 720521231. The next prime is 720521261. The reversal of 720521250 is 52125027.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 720521250.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1015896 + ... + 1016604.

It is an arithmetic number, because the mean of its divisors is an integer number (22624008).

Almost surely, 2^720521250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720521250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904960320).

720521250 is an abundant number, since it is smaller than the sum of its proper divisors (1089399390).

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

720521250 is a wasteful number, since it uses less digits than its factorization.

720521250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 720521250 is about 26842.5268929734. The cubic root of 720521250 is about 896.4971871582.

Adding to 720521250 its reverse (52125027), we get a palindrome (772646277).

The spelling of 720521250 in words is "seven hundred twenty million, five hundred twenty-one thousand, two hundred fifty".