645236046 has 192 divisors, whose sum is σ = 1808142336. Its totient is φ = 161740800.

The previous prime is 645235963. The next prime is 645236099. The reversal of 645236046 is 640632546.

645236046 is a `hidden beast` number, since 6 + 45 + 2 + 3 + 604 + 6 = 666.

645236046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645236046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4925401 + ... + 4925531.

It is an arithmetic number, because the mean of its divisors is an integer number (9417408).

Almost surely, 2^645236046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645236046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904071168).

645236046 is an abundant number, since it is smaller than the sum of its proper divisors (1162906290).

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

645236046 is a wasteful number, since it uses less digits than its factorization.

645236046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 645236046 is about 25401.4969243940. The cubic root of 645236046 is about 864.1176456957.

The spelling of 645236046 in words is "six hundred forty-five million, two hundred thirty-six thousand, forty-six".