63824381 has 4 divisors (see below), whose sum is σ = 65883264. Its totient is φ = 61765500.

The previous prime is 63824377. The next prime is 63824393. The reversal of 63824381 is 18342836.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63824381 - 2² = 63824377 is a prime.

It is a super-2 number, since 2×63824381² = 8147103220066322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63824081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1029395 + ... + 1029456.

It is an arithmetic number, because the mean of its divisors is an integer number (16470816).

Almost surely, 2^63824381 is an apocalyptic number.

It is an amenable number.

63824381 is a deficient number, since it is larger than the sum of its proper divisors (2058883).

63824381 is a wasteful number, since it uses less digits than its factorization.

63824381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058882.

The product of its digits is 27648, while the sum is 35.

The square root of 63824381 is about 7989.0162723579. The cubic root of 63824381 is about 399.6337919147.

The spelling of 63824381 in words is "sixty-three million, eight hundred twenty-four thousand, three hundred eighty-one".