253721616 has 40 divisors (see below), whose sum is σ = 660624384. Its totient is φ = 83905920.

The previous prime is 253721603. The next prime is 253721641. The reversal of 253721616 is 616127352.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14715 + ... + 26906.

Almost surely, 2^253721616 is an apocalyptic number.

It is an amenable number.

253721616 is an abundant number, since it is smaller than the sum of its proper divisors (406902768).

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

253721616 is a wasteful number, since it uses less digits than its factorization.

253721616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41759 (or 41753 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 253721616 is about 15928.6413733250. The cubic root of 253721616 is about 633.0711020261.

Adding to 253721616 its reverse (616127352), we get a palindrome (869848968).

The spelling of 253721616 in words is "two hundred fifty-three million, seven hundred twenty-one thousand, six hundred sixteen".