645209467 has 16 divisors (see below), whose sum is σ = 792714240. Its totient is φ = 512777088.

The previous prime is 645209459. The next prime is 645209473. The reversal of 645209467 is 764902546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645209467 - 2³ = 645209459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645209267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45358 + ... + 57859.

It is an arithmetic number, because the mean of its divisors is an integer number (49544640).

Almost surely, 2^645209467 is an apocalyptic number.

645209467 is a deficient number, since it is larger than the sum of its proper divisors (147504773).

645209467 is a wasteful number, since it uses less digits than its factorization.

645209467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103290.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 645209467 is about 25400.9737411777. The cubic root of 645209467 is about 864.1057804264.

The spelling of 645209467 in words is "six hundred forty-five million, two hundred nine thousand, four hundred sixty-seven".