645471277 has 8 divisors (see below), whose sum is σ = 709696512. Its totient is φ = 582170400.

The previous prime is 645471263. The next prime is 645471293. The reversal of 645471277 is 772174546.

645471277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645471277 - 2¹¹ = 645469229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645471227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229624 + ... + 232417.

It is an arithmetic number, because the mean of its divisors is an integer number (88712064).

Almost surely, 2^645471277 is an apocalyptic number.

It is an amenable number.

645471277 is a deficient number, since it is larger than the sum of its proper divisors (64225235).

645471277 is a wasteful number, since it uses less digits than its factorization.

645471277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462179.

The product of its digits is 329280, while the sum is 43.

The square root of 645471277 is about 25406.1267610787. The cubic root of 645471277 is about 864.2226421864. Note that the first 3 decimals are identical.

The spelling of 645471277 in words is "six hundred forty-five million, four hundred seventy-one thousand, two hundred seventy-seven".