63728291 has 8 divisors (see below), whose sum is σ = 73611504. Its totient is φ = 54526720.

The previous prime is 63728243. The next prime is 63728293. The reversal of 63728291 is 19282736.

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 63728291 - 2¹⁸ = 63466147 is a prime.

It is a super-2 number, since 2×63728291² = 8122590147561362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63728293) 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, 170210 + ... + 170583.

It is an arithmetic number, because the mean of its divisors is an integer number (9201438).

Almost surely, 2^63728291 is an apocalyptic number.

63728291 is a deficient number, since it is larger than the sum of its proper divisors (9883213).

63728291 is a wasteful number, since it uses less digits than its factorization.

63728291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340821.

The product of its digits is 36288, while the sum is 38.

The square root of 63728291 is about 7983.0001252662. Note that the first 3 decimals coincide. The cubic root of 63728291 is about 399.4331366276.

The spelling of 63728291 in words is "sixty-three million, seven hundred twenty-eight thousand, two hundred ninety-one".