645227520 has 352 divisors, whose sum is σ = 2504348928. Its totient is φ = 138412032.

The previous prime is 645227501. The next prime is 645227543. The reversal of 645227520 is 25722546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1827664 + ... + 1828016.

Almost surely, 2^645227520 is an apocalyptic number.

645227520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645227520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252174464).

645227520 is an abundant number, since it is smaller than the sum of its proper divisors (1859121408).

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

645227520 is a wasteful number, since it uses less digits than its factorization.

645227520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 645227520 is about 25401.3290990846. The cubic root of 645227520 is about 864.1138395953.

The spelling of 645227520 in words is "six hundred forty-five million, two hundred twenty-seven thousand, five hundred twenty".