63720828 has 36 divisors (see below), whose sum is σ = 170548560. Its totient is φ = 19990656.

The previous prime is 63720827. The next prime is 63720829. The reversal of 63720828 is 82802736.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (63720827) and next prime (63720829).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 63720792 and 63720801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63720827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51448 + ... + 52671.

It is an arithmetic number, because the mean of its divisors is an integer number (4737460).

Almost surely, 2^63720828 is an apocalyptic number.

63720828 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

63720828 is an abundant number, since it is smaller than the sum of its proper divisors (106827732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63720828 is a wasteful number, since it uses less digits than its factorization.

63720828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104146 (or 104141 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 63720828 is about 7982.5326807975. The cubic root of 63720828 is about 399.4175439407.

The spelling of 63720828 in words is "sixty-three million, seven hundred twenty thousand, eight hundred twenty-eight".