645347417 has 32 divisors (see below), whose sum is σ = 775689600. Its totient is φ = 529182720.

The previous prime is 645347413. The next prime is 645347431. The reversal of 645347417 is 714743546.

It is not a de Polignac number, because 645347417 - 2² = 645347413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645347413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1848959 + ... + 1849307.

It is an arithmetic number, because the mean of its divisors is an integer number (24240300).

Almost surely, 2^645347417 is an apocalyptic number.

645347417 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

645347417 is a deficient number, since it is larger than the sum of its proper divisors (130342183).

645347417 is a wasteful number, since it uses less digits than its factorization.

645347417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its digits is 282240, while the sum is 41.

The square root of 645347417 is about 25403.6890431291. The cubic root of 645347417 is about 864.1673598587.

The spelling of 645347417 in words is "six hundred forty-five million, three hundred forty-seven thousand, four hundred seventeen".