451393864 has 8 divisors (see below), whose sum is σ = 846363510. Its totient is φ = 225696928.

The previous prime is 451393853. The next prime is 451393867. The reversal of 451393864 is 468393154.

It can be written as a sum of positive squares in only one way, i.e., 449016100 + 2377764 = 21190^2 + 1542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 451393864.

It is not an unprimeable number, because it can be changed into a prime (451393867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28212109 + ... + 28212124.

Almost surely, 2^451393864 is an apocalyptic number.

It is an amenable number.

451393864 is a deficient number, since it is larger than the sum of its proper divisors (394969646).

451393864 is a wasteful number, since it uses less digits than its factorization.

451393864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56424239 (or 56424235 counting only the distinct ones).

The product of its digits is 311040, while the sum is 43.

The square root of 451393864 is about 21246.0317235949. The cubic root of 451393864 is about 767.0998251253.

The spelling of 451393864 in words is "four hundred fifty-one million, three hundred ninety-three thousand, eight hundred sixty-four".