645707348 has 48 divisors (see below), whose sum is σ = 1330385280. Its totient is φ = 270345600.

The previous prime is 645707327. The next prime is 645707423. The reversal of 645707348 is 843707546.

It is a super-2 number, since 2×645707348² = 833875958522386208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 645707299 and 645707308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360038 + ... + 361826.

It is an arithmetic number, because the mean of its divisors is an integer number (27716360).

Almost surely, 2^645707348 is an apocalyptic number.

It is an amenable number.

645707348 is an abundant number, since it is smaller than the sum of its proper divisors (684677932).

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

645707348 is a wasteful number, since it uses less digits than its factorization.

645707348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448 (or 2446 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 44.

The square root of 645707348 is about 25410.7722826364. The cubic root of 645707348 is about 864.3279879720.

The spelling of 645707348 in words is "six hundred forty-five million, seven hundred seven thousand, three hundred forty-eight".