645033405 has 16 divisors (see below), whose sum is σ = 1054013184. Its totient is φ = 336697920.

The previous prime is 645033391. The next prime is 645033407. The reversal of 645033405 is 504330546.

It is not a de Polignac number, because 645033405 - 2⁹ = 645032893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645033407) 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, 456766 + ... + 458175.

It is an arithmetic number, because the mean of its divisors is an integer number (65875824).

Almost surely, 2^645033405 is an apocalyptic number.

It is an amenable number.

645033405 is a deficient number, since it is larger than the sum of its proper divisors (408979779).

645033405 is a wasteful number, since it uses less digits than its factorization.

645033405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914996.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 645033405 is about 25397.5078501809. The cubic root of 645033405 is about 864.0271754463.

The spelling of 645033405 in words is "six hundred forty-five million, thirty-three thousand, four hundred five".