645248892 has 24 divisors (see below), whose sum is σ = 1584822400. Its totient is φ = 203762736.

The previous prime is 645248887. The next prime is 645248893. The reversal of 645248892 is 298842546.

It is a happy number.

It is a super-2 number, since 2×645248892² = 832692265254455328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645248893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414792 + ... + 1415247.

Almost surely, 2^645248892 is an apocalyptic number.

It is an amenable number.

645248892 is an abundant number, since it is smaller than the sum of its proper divisors (939573508).

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

645248892 is a wasteful number, since it uses less digits than its factorization.

645248892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830065 (or 2830063 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The square root of 645248892 is about 25401.7497822493. The cubic root of 645248892 is about 864.1233802284.

The spelling of 645248892 in words is "six hundred forty-five million, two hundred forty-eight thousand, eight hundred ninety-two".