645347043 has 12 divisors (see below), whose sum is σ = 1016910648. Its totient is φ = 391119360.

The previous prime is 645347029. The next prime is 645347051. The reversal of 645347043 is 340743546.

It is a happy number.

645347043 is a `hidden beast` number, since 645 + 3 + 4 + 7 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 645347043 - 2¹³ = 645338851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645346989 and 645347007.

It is not an unprimeable number, because it can be changed into a prime (645347543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3259230 + ... + 3259427.

It is an arithmetic number, because the mean of its divisors is an integer number (84742554).

Almost surely, 2^645347043 is an apocalyptic number.

645347043 is a deficient number, since it is larger than the sum of its proper divisors (371563605).

645347043 is a wasteful number, since it uses less digits than its factorization.

645347043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6518674 (or 6518671 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 36.

The square root of 645347043 is about 25403.6816819925. The cubic root of 645347043 is about 864.1671929208.

The spelling of 645347043 in words is "six hundred forty-five million, three hundred forty-seven thousand, forty-three".