451491860 has 24 divisors (see below), whose sum is σ = 961124136. Its totient is φ = 178122240.

The previous prime is 451491853. The next prime is 451491869. The reversal of 451491860 is 68194154.

It can be written as a sum of positive squares in 4 ways, for example, as 42562576 + 408929284 = 6524^2 + 20222^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451491869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153161 + ... + 156080.

It is an arithmetic number, because the mean of its divisors is an integer number (40046839).

Almost surely, 2^451491860 is an apocalyptic number.

It is an amenable number.

451491860 is an abundant number, since it is smaller than the sum of its proper divisors (509632276).

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

451491860 is a wasteful number, since it uses less digits than its factorization.

451491860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309323 (or 309321 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 451491860 is about 21248.3378173447. The cubic root of 451491860 is about 767.1553326552.

The spelling of 451491860 in words is "four hundred fifty-one million, four hundred ninety-one thousand, eight hundred sixty".