431634640 has 20 divisors (see below), whose sum is σ = 1003550724. Its totient is φ = 172653824.

The previous prime is 431634551. The next prime is 431634661. The reversal of 431634640 is 46436134.

It is a happy number.

431634640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 106337344 + 325297296 = 10312^2 + 18036^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2697637 + ... + 2697796.

Almost surely, 2^431634640 is an apocalyptic number.

431634640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

431634640 is an abundant number, since it is smaller than the sum of its proper divisors (571916084).

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

431634640 is a wasteful number, since it uses less digits than its factorization.

431634640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395446 (or 5395440 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 431634640 is about 20775.8186360971. The cubic root of 431634640 is about 755.7394565167.

The spelling of 431634640 in words is "four hundred thirty-one million, six hundred thirty-four thousand, six hundred forty".