63493821 has 16 divisors (see below), whose sum is σ = 94299520. Its totient is φ = 42223680.

The previous prime is 63493819. The next prime is 63493889. The reversal of 63493821 is 12839436.

It is not a de Polignac number, because 63493821 - 2¹ = 63493819 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 (63493811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8976 + ... + 14406.

It is an arithmetic number, because the mean of its divisors is an integer number (5893720).

Almost surely, 2^63493821 is an apocalyptic number.

It is an amenable number.

63493821 is a deficient number, since it is larger than the sum of its proper divisors (30805699).

63493821 is a wasteful number, since it uses less digits than its factorization.

63493821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5873 (or 5867 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 63493821 is about 7968.3010108806. The cubic root of 63493821 is about 398.9426680019.

The spelling of 63493821 in words is "sixty-three million, four hundred ninety-three thousand, eight hundred twenty-one".