253521720 has 96 divisors (see below), whose sum is σ = 850561920. Its totient is φ = 65422080.

The previous prime is 253521707. The next prime is 253521733. The reversal of 253521720 is 27125352.

It is an interprime number because it is at equal distance from previous prime (253521707) and next prime (253521733).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199 + ... + 22518.

It is an arithmetic number, because the mean of its divisors is an integer number (8860020).

Almost surely, 2^253521720 is an apocalyptic number.

253521720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 253521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425280960).

253521720 is an abundant number, since it is smaller than the sum of its proper divisors (597040200).

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

253521720 is a wasteful number, since it uses less digits than its factorization.

253521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22765 (or 22758 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 253521720 is about 15922.3654021631. The cubic root of 253521720 is about 632.9048021374.

It can be divided in two parts, 25352 and 1720, that added together give a palindrome (27072).

The spelling of 253521720 in words is "two hundred fifty-three million, five hundred twenty-one thousand, seven hundred twenty".