645174387 has 96 divisors (see below), whose sum is σ = 1148399616. Its totient is φ = 343699200.

The previous prime is 645174377. The next prime is 645174389. The reversal of 645174387 is 783471546.

645174387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645174387 - 2¹⁰ = 645173363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645174389) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4109313 + ... + 4109469.

It is an arithmetic number, because the mean of its divisors is an integer number (11962496).

Almost surely, 2^645174387 is an apocalyptic number.

645174387 is a deficient number, since it is larger than the sum of its proper divisors (503225229).

645174387 is a wasteful number, since it uses less digits than its factorization.

645174387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 318 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 645174387 is about 25400.2832070826. The cubic root of 645174387 is about 864.0901196828.

The spelling of 645174387 in words is "six hundred forty-five million, one hundred seventy-four thousand, three hundred eighty-seven".