645045434 has 48 divisors (see below), whose sum is σ = 1111773600. Its totient is φ = 280119840.

The previous prime is 645045409. The next prime is 645045449. The reversal of 645045434 is 434540546.

It is a super-2 number, since 2×645045434² = 832167223848496712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645045394 and 645045403.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 750497 + ... + 751355.

It is an arithmetic number, because the mean of its divisors is an integer number (23161950).

Almost surely, 2^645045434 is an apocalyptic number.

645045434 is a deficient number, since it is larger than the sum of its proper divisors (466728166).

645045434 is a wasteful number, since it uses less digits than its factorization.

645045434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1008 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

The square root of 645045434 is about 25397.7446636507. The cubic root of 645045434 is about 864.0325463920.

The spelling of 645045434 in words is "six hundred forty-five million, forty-five thousand, four hundred thirty-four".