451809612 has 72 divisors (see below), whose sum is σ = 1218986496. Its totient is φ = 140603904.

The previous prime is 451809559. The next prime is 451809619. The reversal of 451809612 is 216908154.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (451809619) 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, 74818 + ... + 80630.

It is an arithmetic number, because the mean of its divisors is an integer number (16930368).

Almost surely, 2^451809612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 451809612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (609493248).

451809612 is an abundant number, since it is smaller than the sum of its proper divisors (767176884).

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

451809612 is a wasteful number, since it uses less digits than its factorization.

451809612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5967 (or 5962 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 451809612 is about 21255.8136047529. The cubic root of 451809612 is about 767.3352605781.

The spelling of 451809612 in words is "four hundred fifty-one million, eight hundred nine thousand, six hundred twelve".