645348449 has 8 divisors (see below), whose sum is σ = 647687040. Its totient is φ = 643015296.

The previous prime is 645348427. The next prime is 645348527. The reversal of 645348449 is 944843546.

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 645348449 - 2¹² = 645344353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645348419) 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, 488612 + ... + 489930.

It is an arithmetic number, because the mean of its divisors is an integer number (80960880).

Almost surely, 2^645348449 is an apocalyptic number.

It is an amenable number.

645348449 is a deficient number, since it is larger than the sum of its proper divisors (2338591).

645348449 is a wasteful number, since it uses less digits than its factorization.

645348449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2719.

The product of its digits is 1658880, while the sum is 47.

The square root of 645348449 is about 25403.7093551316. The cubic root of 645348449 is about 864.1678204996.

The spelling of 645348449 in words is "six hundred forty-five million, three hundred forty-eight thousand, four hundred forty-nine".