645164436 has 48 divisors (see below), whose sum is σ = 1775943680. Its totient is φ = 178385760.

The previous prime is 645164417. The next prime is 645164459. The reversal of 645164436 is 634461546.

645164436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645164394 and 645164403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121276 + ... + 126483.

Almost surely, 2^645164436 is an apocalyptic number.

It is an amenable number.

645164436 is an abundant number, since it is smaller than the sum of its proper divisors (1130779244).

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

645164436 is a wasteful number, since it uses less digits than its factorization.

645164436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247804 (or 247802 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 645164436 is about 25400.0873226845. The cubic root of 645164436 is about 864.0856771604.

The spelling of 645164436 in words is "six hundred forty-five million, one hundred sixty-four thousand, four hundred thirty-six".