63212705 has 4 divisors (see below), whose sum is σ = 75855252. Its totient is φ = 50570160.

The previous prime is 63212701. The next prime is 63212707. The reversal of 63212705 is 50721236.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12418576 + 50794129 = 3524^2 + 7127^2 .

It is not a de Polignac number, because 63212705 - 2² = 63212701 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63212701) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6321266 + ... + 6321275.

It is an arithmetic number, because the mean of its divisors is an integer number (18963813).

Almost surely, 2^63212705 is an apocalyptic number.

It is an amenable number.

63212705 is a deficient number, since it is larger than the sum of its proper divisors (12642547).

63212705 is a wasteful number, since it uses less digits than its factorization.

63212705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12642546.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 63212705 is about 7950.6417979934. The cubic root of 63212705 is about 398.3530301160.

The spelling of 63212705 in words is "sixty-three million, two hundred twelve thousand, seven hundred five".