431491864 has 8 divisors (see below), whose sum is σ = 809047260. Its totient is φ = 215745928.

The previous prime is 431491811. The next prime is 431491867. The reversal of 431491864 is 468194134.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431491867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26968234 + ... + 26968249.

Almost surely, 2^431491864 is an apocalyptic number.

It is an amenable number.

431491864 is a deficient number, since it is larger than the sum of its proper divisors (377555396).

431491864 is a wasteful number, since it uses less digits than its factorization.

431491864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53936489 (or 53936485 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 431491864 is about 20772.3822418133. The cubic root of 431491864 is about 755.6561195569.

The spelling of 431491864 in words is "four hundred thirty-one million, four hundred ninety-one thousand, eight hundred sixty-four".