645262044 has 24 divisors (see below), whose sum is σ = 1720699008. Its totient is φ = 184360560.

The previous prime is 645262043. The next prime is 645262049. The reversal of 645262044 is 440262546.

It is a junction number, because it is equal to n+sod(n) for n = 645261996 and 645262014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645262043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3840762 + ... + 3840929.

It is an arithmetic number, because the mean of its divisors is an integer number (71695792).

Almost surely, 2^645262044 is an apocalyptic number.

It is an amenable number.

645262044 is an abundant number, since it is smaller than the sum of its proper divisors (1075436964).

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

645262044 is a wasteful number, since it uses less digits than its factorization.

645262044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7681705 (or 7681703 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 645262044 is about 25402.0086607339. The cubic root of 645262044 is about 864.1292512825.

The spelling of 645262044 in words is "six hundred forty-five million, two hundred sixty-two thousand, forty-four".