645114942 has 72 divisors (see below), whose sum is σ = 1530239256. Its totient is φ = 203665104.

The previous prime is 645114941. The next prime is 645114949. The reversal of 645114942 is 249411546.

645114942 is a `hidden beast` number, since 64 + 511 + 49 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 645114897 and 645114906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645114941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 173608 + ... + 177284.

It is an arithmetic number, because the mean of its divisors is an integer number (21253323).

Almost surely, 2^645114942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645114942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765119628).

645114942 is an abundant number, since it is smaller than the sum of its proper divisors (885124314).

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

645114942 is a wasteful number, since it uses less digits than its factorization.

645114942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3732 (or 3701 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 645114942 is about 25399.1130160090. The cubic root of 645114942 is about 864.0635803905.

The spelling of 645114942 in words is "six hundred forty-five million, one hundred fourteen thousand, nine hundred forty-two".