645543532 has 12 divisors (see below), whose sum is σ = 1132959240. Its totient is φ = 321840896.

The previous prime is 645543517. The next prime is 645543581. The reversal of 645543532 is 235345546.

It is a junction number, because it is equal to n+sod(n) for n = 645543491 and 645543500.

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, 231157 + ... + 233932.

It is an arithmetic number, because the mean of its divisors is an integer number (94413270).

Almost surely, 2^645543532 is an apocalyptic number.

It is an amenable number.

645543532 is a deficient number, since it is larger than the sum of its proper divisors (487415708).

645543532 is a wasteful number, since it uses less digits than its factorization.

645543532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465440 (or 465438 counting only the distinct ones).

The product of its digits is 216000, while the sum is 37.

The square root of 645543532 is about 25407.5487208034. The cubic root of 645543532 is about 864.2548884326.

It can be divided in two parts, 64554 and 3532, that added together give a palindrome (68086).

The spelling of 645543532 in words is "six hundred forty-five million, five hundred forty-three thousand, five hundred thirty-two".