645147140 has 24 divisors (see below), whose sum is σ = 1477973952. Its totient is φ = 234598880.

The previous prime is 645147121. The next prime is 645147157. The reversal of 645147140 is 41741546.

It is a junction number, because it is equal to n+sod(n) for n = 645147097 and 645147106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1466024 + ... + 1466463.

It is an arithmetic number, because the mean of its divisors is an integer number (61582248).

Almost surely, 2^645147140 is an apocalyptic number.

It is an amenable number.

645147140 is an abundant number, since it is smaller than the sum of its proper divisors (832826812).

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

645147140 is a wasteful number, since it uses less digits than its factorization.

645147140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932507 (or 2932505 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 645147140 is about 25399.7468491322. The cubic root of 645147140 is about 864.0779554290.

Adding to 645147140 its reverse (41741546), we get a palindrome (686888686).

The spelling of 645147140 in words is "six hundred forty-five million, one hundred forty-seven thousand, one hundred forty".