645001512 has 128 divisors (see below), whose sum is σ = 1793664000. Its totient is φ = 192360960.

The previous prime is 645001459. The next prime is 645001519. The reversal of 645001512 is 215100546.

It is a super-2 number, since 2×645001512² = 832053900964572288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (645001519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 933087 + ... + 933777.

It is an arithmetic number, because the mean of its divisors is an integer number (14013000).

Almost surely, 2^645001512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645001512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896832000).

645001512 is an abundant number, since it is smaller than the sum of its proper divisors (1148662488).

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

645001512 is a wasteful number, since it uses less digits than its factorization.

645001512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 645001512 is about 25396.8799658541. The cubic root of 645001512 is about 864.0129349058.

The spelling of 645001512 in words is "six hundred forty-five million, one thousand, five hundred twelve".