645861467 has 8 divisors (see below), whose sum is σ = 685326096. Its totient is φ = 606560512.

The previous prime is 645861431. The next prime is 645861481. The reversal of 645861467 is 764168546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645861467 - 2¹² = 645857371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645861487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32738 + ... + 48615.

It is an arithmetic number, because the mean of its divisors is an integer number (85665762).

Almost surely, 2^645861467 is an apocalyptic number.

645861467 is a deficient number, since it is larger than the sum of its proper divisors (39464629).

645861467 is a wasteful number, since it uses less digits than its factorization.

645861467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81837.

The product of its digits is 967680, while the sum is 47.

The square root of 645861467 is about 25413.8046541638. The cubic root of 645861467 is about 864.3967491369.

The spelling of 645861467 in words is "six hundred forty-five million, eight hundred sixty-one thousand, four hundred sixty-seven".