645824752 has 20 divisors (see below), whose sum is σ = 1252341720. Its totient is φ = 322639808.

The previous prime is 645824731. The next prime is 645824759. The reversal of 645824752 is 257428546.

It is a happy number.

It is a super-2 number, since 2×645824752² = 834179220591723008, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645824699 and 645824708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645824759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3243 + ... + 36085.

It is an arithmetic number, because the mean of its divisors is an integer number (62617086).

Almost surely, 2^645824752 is an apocalyptic number.

It is an amenable number.

645824752 is a deficient number, since it is larger than the sum of its proper divisors (606516968).

645824752 is a wasteful number, since it uses less digits than its factorization.

645824752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34080 (or 34074 counting only the distinct ones).

The product of its digits is 537600, while the sum is 43.

The square root of 645824752 is about 25413.0823002642. The cubic root of 645824752 is about 864.3803695005.

The spelling of 645824752 in words is "six hundred forty-five million, eight hundred twenty-four thousand, seven hundred fifty-two".