645748512 has 24 divisors (see below), whose sum is σ = 1695090096. Its totient is φ = 215249472.

The previous prime is 645748511. The next prime is 645748513. The reversal of 645748512 is 215847546.

It is a happy number.

645748512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645748511) and next prime (645748513).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×645748512² = 833982281500428288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (645748511) 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, 3363178 + ... + 3363369.

It is an arithmetic number, because the mean of its divisors is an integer number (70628754).

Almost surely, 2^645748512 is an apocalyptic number.

It is an amenable number.

645748512 is an abundant number, since it is smaller than the sum of its proper divisors (1049341584).

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

645748512 is a wasteful number, since it uses less digits than its factorization.

645748512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6726560 (or 6726552 counting only the distinct ones).

The product of its digits is 268800, while the sum is 42.

The square root of 645748512 is about 25411.5822411750. The cubic root of 645748512 is about 864.3463546213.

The spelling of 645748512 in words is "six hundred forty-five million, seven hundred forty-eight thousand, five hundred twelve".