63728290 has 32 divisors (see below), whose sum is σ = 116638704. Its totient is φ = 25067520.

The previous prime is 63728243. The next prime is 63728293. The reversal of 63728290 is 9282736.

63728290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 7983²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 29517489 + 34210801 = 5433^2 + 5849^2 .

It is a super-2 number, since 2×63728290² = 8122589892648200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63728293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247842 + ... + 248098.

Almost surely, 2^63728290 is an apocalyptic number.

63728290 is a deficient number, since it is larger than the sum of its proper divisors (52910414).

63728290 is a wasteful number, since it uses less digits than its factorization.

63728290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 63728290 is about 7983.0000626331. Note that the first 4 decimals coincide. The cubic root of 63728290 is about 399.4331345384.

The spelling of 63728290 in words is "sixty-three million, seven hundred twenty-eight thousand, two hundred ninety".