645975374 has 16 divisors (see below), whose sum is σ = 1059727536. Its totient is φ = 292881600.

The previous prime is 645975373. The next prime is 645975389. The reversal of 645975374 is 473579546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645975373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28247 + ... + 45714.

It is an arithmetic number, because the mean of its divisors is an integer number (66232971).

Almost surely, 2^645975374 is an apocalyptic number.

645975374 is a deficient number, since it is larger than the sum of its proper divisors (413752162).

645975374 is a wasteful number, since it uses less digits than its factorization.

645975374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74371.

The product of its digits is 3175200, while the sum is 50.

The square root of 645975374 is about 25416.0456011552. The cubic root of 645975374 is about 864.4475624345.

The spelling of 645975374 in words is "six hundred forty-five million, nine hundred seventy-five thousand, three hundred seventy-four".