4521720 has 96 divisors (see below), whose sum is σ = 15800400. Its totient is φ = 1032192.

The previous prime is 4521707. The next prime is 4521721. The reversal of 4521720 is 271254.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4521721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5496 + ... + 6264.

Almost surely, 2^4521720 is an apocalyptic number.

4521720 is a gapful number since it is divisible by the number (40) 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 4521720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7900200).

4521720 is an abundant number, since it is smaller than the sum of its proper divisors (11278680).

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

4521720 is a wasteful number, since it uses less digits than its factorization.

4521720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 4521720 is about 2126.4336340455. The cubic root of 4521720 is about 165.3615579343.

Adding to 4521720 its reverse (271254), we get a palindrome (4792974).

The spelling of 4521720 in words is "four million, five hundred twenty-one thousand, seven hundred twenty".