645141272 has 8 divisors (see below), whose sum is σ = 1209639900. Its totient is φ = 322570632.

The previous prime is 645141271. The next prime is 645141349. The reversal of 645141272 is 272141546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645141271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40321322 + ... + 40321337.

Almost surely, 2^645141272 is an apocalyptic number.

It is an amenable number.

645141272 is a deficient number, since it is larger than the sum of its proper divisors (564498628).

645141272 is a wasteful number, since it uses less digits than its factorization.

645141272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80642665 (or 80642661 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 645141272 is about 25399.6313359072. The cubic root of 645141272 is about 864.0753356521.

The spelling of 645141272 in words is "six hundred forty-five million, one hundred forty-one thousand, two hundred seventy-two".