451043640 has 160 divisors (see below), whose sum is σ = 1537580880. Its totient is φ = 118568448.

The previous prime is 451043633. The next prime is 451043647. The reversal of 451043640 is 46340154.

451043640 is a `hidden beast` number, since 4 + 5 + 10 + 4 + 3 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (451043633) and next prime (451043647).

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 (451043647) 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 39 ways as a sum of consecutive naturals, for example, 235567 + ... + 237473.

Almost surely, 2^451043640 is an apocalyptic number.

451043640 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 451043640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768790440).

451043640 is an abundant number, since it is smaller than the sum of its proper divisors (1086537240).

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

451043640 is a wasteful number, since it uses less digits than its factorization.

451043640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 451043640 is about 21237.7880204130. The cubic root of 451043640 is about 766.9013832902.

Adding to 451043640 its reverse (46340154), we get a palindrome (497383794).

The spelling of 451043640 in words is "four hundred fifty-one million, forty-three thousand, six hundred forty".