645366942 has 24 divisors (see below), whose sum is σ = 1525413240. Its totient is φ = 195565680.

The previous prime is 645366941. The next prime is 645366947. The reversal of 645366942 is 249663546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645366941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1629517 + ... + 1629912.

It is an arithmetic number, because the mean of its divisors is an integer number (63558885).

Almost surely, 2^645366942 is an apocalyptic number.

645366942 is an abundant number, since it is smaller than the sum of its proper divisors (880046298).

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

645366942 is a wasteful number, since it uses less digits than its factorization.

645366942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259448 (or 3259445 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 645366942 is about 25404.0733348020. The cubic root of 645366942 is about 864.1760749048.

The spelling of 645366942 in words is "six hundred forty-five million, three hundred sixty-six thousand, nine hundred forty-two".