645096440 has 16 divisors (see below), whose sum is σ = 1451467080. Its totient is φ = 258038560.

The previous prime is 645096367. The next prime is 645096457. The reversal of 645096440 is 44690546.

It is a happy number.

It is a super-2 number, since 2×645096440² = 832298833801347200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645096394 and 645096403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063666 + ... + 8063745.

Almost surely, 2^645096440 is an apocalyptic number.

It is an amenable number.

645096440 is an abundant number, since it is smaller than the sum of its proper divisors (806370640).

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

645096440 is a wasteful number, since it uses less digits than its factorization.

645096440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16127422 (or 16127418 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 645096440 is about 25398.7487880801. The cubic root of 645096440 is about 864.0553198176.

The spelling of 645096440 in words is "six hundred forty-five million, ninety-six thousand, four hundred forty".