721145250 has 288 divisors, whose sum is σ = 2352609792. Its totient is φ = 158760000.

The previous prime is 721145231. The next prime is 721145261. The reversal of 721145250 is 52541127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3417645 + ... + 3417855.

It is an arithmetic number, because the mean of its divisors is an integer number (8168784).

Almost surely, 2^721145250 is an apocalyptic number.

721145250 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 721145250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1176304896).

721145250 is an abundant number, since it is smaller than the sum of its proper divisors (1631464542).

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

721145250 is a wasteful number, since it uses less digits than its factorization.

721145250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 721145250 is about 26854.1477243274. The cubic root of 721145250 is about 896.7559131989.

Adding to 721145250 its reverse (52541127), we get a palindrome (773686377).

The spelling of 721145250 in words is "seven hundred twenty-one million, one hundred forty-five thousand, two hundred fifty".