4128787720 has 32 divisors (see below), whose sum is σ = 9302209920. Its totient is φ = 1649304000.

The previous prime is 4128787703. The next prime is 4128787771. The reversal of 4128787720 is 277878214.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 38682 + ... + 98761.

It is an arithmetic number, because the mean of its divisors is an integer number (290694060).

Almost surely, 2^4128787720 is an apocalyptic number.

4128787720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4128787720 is an abundant number, since it is smaller than the sum of its proper divisors (5173422200).

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

4128787720 is a wasteful number, since it uses less digits than its factorization.

4128787720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138205 (or 138201 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 46.

The square root of 4128787720 is about 64255.6434875568. The cubic root of 4128787720 is about 1604.2578932891.

The spelling of 4128787720 in words is "four billion, one hundred twenty-eight million, seven hundred eighty-seven thousand, seven hundred twenty".