645254616 has 32 divisors (see below), whose sum is σ = 1632576960. Its totient is φ = 212492832.

The previous prime is 645254609. The next prime is 645254639. The reversal of 645254616 is 616452546.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 159970 + ... + 163953.

It is an arithmetic number, because the mean of its divisors is an integer number (51018030).

Almost surely, 2^645254616 is an apocalyptic number.

It is an amenable number.

645254616 is an abundant number, since it is smaller than the sum of its proper divisors (987322344).

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

645254616 is a wasteful number, since it uses less digits than its factorization.

645254616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324015 (or 324011 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 645254616 is about 25401.8624514030. The cubic root of 645254616 is about 864.1259354324.

The spelling of 645254616 in words is "six hundred forty-five million, two hundred fifty-four thousand, six hundred sixteen".