645122652 has 24 divisors (see below), whose sum is σ = 1507938432. Its totient is φ = 214662000.

The previous prime is 645122633. The next prime is 645122689. The reversal of 645122652 is 256221546.

It is a super-2 number, since 2×645122652² = 832366472247026208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40224 + ... + 53927.

It is an arithmetic number, because the mean of its divisors is an integer number (62830768).

Almost surely, 2^645122652 is an apocalyptic number.

It is an amenable number.

645122652 is an abundant number, since it is smaller than the sum of its proper divisors (862815780).

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

645122652 is a wasteful number, since it uses less digits than its factorization.

645122652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94729 (or 94727 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 645122652 is about 25399.2647925093. The cubic root of 645122652 is about 864.0670226214.

The spelling of 645122652 in words is "six hundred forty-five million, one hundred twenty-two thousand, six hundred fifty-two".