63641015 has 4 divisors (see below), whose sum is σ = 76369224. Its totient is φ = 50912808.

The previous prime is 63640981. The next prime is 63641033. The reversal of 63641015 is 51014636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63641015 - 2¹⁸ = 63378871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6364097 + ... + 6364106.

It is an arithmetic number, because the mean of its divisors is an integer number (19092306).

Almost surely, 2^63641015 is an apocalyptic number.

63641015 is a deficient number, since it is larger than the sum of its proper divisors (12728209).

63641015 is a wasteful number, since it uses less digits than its factorization.

63641015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12728208.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 63641015 is about 7977.5318864922. The cubic root of 63641015 is about 399.2507118780.

The spelling of 63641015 in words is "sixty-three million, six hundred forty-one thousand, fifteen".