645424326 has 24 divisors (see below), whose sum is σ = 1400925240. Its totient is φ = 214755936.

The previous prime is 645424291. The next prime is 645424327. The reversal of 645424326 is 623424546.

645424326 is a `hidden beast` number, since 645 + 4 + 2 + 4 + 3 + 2 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645424327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21711 + ... + 41978.

It is an arithmetic number, because the mean of its divisors is an integer number (58371885).

Almost surely, 2^645424326 is an apocalyptic number.

645424326 is an abundant number, since it is smaller than the sum of its proper divisors (755500914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645424326 is a wasteful number, since it uses less digits than its factorization.

645424326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64260 (or 64257 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 645424326 is about 25405.2027348730. The cubic root of 645424326 is about 864.2016874191.

The spelling of 645424326 in words is "six hundred forty-five million, four hundred twenty-four thousand, three hundred twenty-six".