645041740 has 48 divisors (see below), whose sum is σ = 1565524800. Its totient is φ = 218668032.

The previous prime is 645041737. The next prime is 645041741. The reversal of 645041740 is 47140546.

It is not an unprimeable number, because it can be changed into a prime (645041741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13425 + ... + 38344.

It is an arithmetic number, because the mean of its divisors is an integer number (32615100).

Almost surely, 2^645041740 is an apocalyptic number.

It is an amenable number.

645041740 is an abundant number, since it is smaller than the sum of its proper divisors (920483060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645041740 is a wasteful number, since it uses less digits than its factorization.

645041740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51874 (or 51872 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 645041740 is about 25397.6719405539. The cubic root of 645041740 is about 864.0308970290.

The spelling of 645041740 in words is "six hundred forty-five million, forty-one thousand, seven hundred forty".