645401336 has 32 divisors (see below), whose sum is σ = 1244980800. Its totient is φ = 313474560.

The previous prime is 645401327. The next prime is 645401357. The reversal of 645401336 is 633104546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74276 + ... + 82508.

It is an arithmetic number, because the mean of its divisors is an integer number (38905650).

Almost surely, 2^645401336 is an apocalyptic number.

It is an amenable number.

645401336 is a deficient number, since it is larger than the sum of its proper divisors (599579464).

645401336 is a wasteful number, since it uses less digits than its factorization.

645401336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8519 (or 8515 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 645401336 is about 25404.7502644683. The cubic root of 645401336 is about 864.1914263491.

The spelling of 645401336 in words is "six hundred forty-five million, four hundred one thousand, three hundred thirty-six".