645015312 has 120 divisors (see below), whose sum is σ = 1953666624. Its totient is φ = 205628544.

The previous prime is 645015299. The next prime is 645015313. The reversal of 645015312 is 213510546.

645015312 is a `hidden beast` number, since 645 + 0 + 1 + 5 + 3 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (645015313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85818 + ... + 93030.

Almost surely, 2^645015312 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 645015312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976833312).

645015312 is an abundant number, since it is smaller than the sum of its proper divisors (1308651312).

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

645015312 is a wasteful number, since it uses less digits than its factorization.

645015312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7259 (or 7241 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 645015312 is about 25397.1516513171. The cubic root of 645015312 is about 864.0190968001.

Adding to 645015312 its reverse (213510546), we get a palindrome (858525858).

The spelling of 645015312 in words is "six hundred forty-five million, fifteen thousand, three hundred twelve".