63740821 has 8 divisors (see below), whose sum is σ = 65678040. Its totient is φ = 61830912.

The previous prime is 63740819. The next prime is 63740849. The reversal of 63740821 is 12804736.

It can be written as a sum of positive squares in 4 ways, for example, as 7700625 + 56040196 = 2775^2 + 7486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63740821 - 2¹ = 63740819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63740861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2040 + ... + 11473.

It is an arithmetic number, because the mean of its divisors is an integer number (8209755).

Almost surely, 2^63740821 is an apocalyptic number.

It is an amenable number.

63740821 is a deficient number, since it is larger than the sum of its proper divisors (1937219).

63740821 is a wasteful number, since it uses less digits than its factorization.

63740821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13655.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 63740821 is about 7983.7848793664. The cubic root of 63740821 is about 399.4593132238.

The spelling of 63740821 in words is "sixty-three million, seven hundred forty thousand, eight hundred twenty-one".