63215645 has 16 divisors (see below), whose sum is σ = 78004080. Its totient is φ = 49152000.

The previous prime is 63215627. The next prime is 63215651. The reversal of 63215645 is 54651236.

It can be written as a sum of positive squares in 8 ways, for example, as 267289 + 62948356 = 517^2 + 7934^2 .

It is not a de Polignac number, because 63215645 - 2¹² = 63211549 is a prime.

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, 81821 + ... + 82589.

It is an arithmetic number, because the mean of its divisors is an integer number (4875255).

Almost surely, 2^63215645 is an apocalyptic number.

It is an amenable number.

63215645 is a deficient number, since it is larger than the sum of its proper divisors (14788435).

63215645 is a wasteful number, since it uses less digits than its factorization.

63215645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216.

The product of its digits is 21600, while the sum is 32.

The square root of 63215645 is about 7950.8266865779. The cubic root of 63215645 is about 398.3592057719.

The spelling of 63215645 in words is "sixty-three million, two hundred fifteen thousand, six hundred forty-five".