431026640 has 40 divisors (see below), whose sum is σ = 1093242528. Its totient is φ = 156736640.

The previous prime is 431026627. The next prime is 431026643. The reversal of 431026640 is 46620134.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431026643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244022 + ... + 245781.

Almost surely, 2^431026640 is an apocalyptic number.

431026640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

431026640 is an abundant number, since it is smaller than the sum of its proper divisors (662215888).

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

431026640 is a wasteful number, since it uses less digits than its factorization.

431026640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489827 (or 489821 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 431026640 is about 20761.1810839364. The cubic root of 431026640 is about 755.3844452322.

Adding to 431026640 its reverse (46620134), we get a palindrome (477646774).

The spelling of 431026640 in words is "four hundred thirty-one million, twenty-six thousand, six hundred forty".