451720 has 32 divisors (see below), whose sum is σ = 1062720. Its totient is φ = 172480.

The previous prime is 451709. The next prime is 451723. The reversal of 451720 is 27154.

451720 is nontrivially palindromic in base 7.

It is not an unprimeable number, because it can be changed into a prime (451723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (33210).

2⁴⁵¹⁷²⁰ is an apocalyptic number.

451720 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 451720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531360).

451720 is an abundant number, since it is smaller than the sum of its proper divisors (611000).

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

451720 is a wasteful number, since it uses less digits than its factorization.

451720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 451720 is about 672.1011828587. The cubic root of 451720 is about 76.7284526086.

Adding to 451720 its reverse (27154), we get a palindrome (478874).

The spelling of 451720 in words is "four hundred fifty-one thousand, seven hundred twenty".