645212132 has 12 divisors (see below), whose sum is σ = 1129336320. Its totient is φ = 322544616.

The previous prime is 645212129. The next prime is 645212153. The reversal of 645212132 is 231212546.

It is a happy 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, 14873 + ... + 38879.

It is an arithmetic number, because the mean of its divisors is an integer number (94111360).

Almost surely, 2^645212132 is an apocalyptic number.

It is an amenable number.

645212132 is a deficient number, since it is larger than the sum of its proper divisors (484124188).

645212132 is a wasteful number, since it uses less digits than its factorization.

645212132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30730 (or 30728 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 645212132 is about 25401.0261997424. The cubic root of 645212132 is about 864.1069701376.

Adding to 645212132 its reverse (231212546), we get a palindrome (876424678).

The spelling of 645212132 in words is "six hundred forty-five million, two hundred twelve thousand, one hundred thirty-two".