451640502 has 64 divisors (see below), whose sum is σ = 1036324800. Its totient is φ = 145704960.

The previous prime is 451640491. The next prime is 451640503. The reversal of 451640502 is 205046154.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451640503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302574 + ... + 304062.

It is an arithmetic number, because the mean of its divisors is an integer number (16192575).

Almost surely, 2^451640502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 451640502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518162400).

451640502 is an abundant number, since it is smaller than the sum of its proper divisors (584684298).

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

451640502 is a wasteful number, since it uses less digits than its factorization.

451640502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 451640502 is about 21251.8352619250. The cubic root of 451640502 is about 767.2395120918.

Adding to 451640502 its reverse (205046154), we get a palindrome (656686656).

The spelling of 451640502 in words is "four hundred fifty-one million, six hundred forty thousand, five hundred two".