102001087720 has 96 divisors (see below), whose sum is σ = 263641824000. Its totient is φ = 34792281216.

The previous prime is 102001087697. The next prime is 102001087751. The reversal of 102001087720 is 27780100201.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11083681 + ... + 11092879.

It is an arithmetic number, because the mean of its divisors is an integer number (2746269000).

Almost surely, 2^102001087720 is an apocalyptic number.

102001087720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102001087720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131820912000).

102001087720 is an abundant number, since it is smaller than the sum of its proper divisors (161640736280).

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

102001087720 is an equidigital number, since it uses as much as digits as its factorization.

102001087720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615 (or 9412 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 102001087720 its reverse (27780100201), we get a palindrome (129781187921).

The spelling of 102001087720 in words is "one hundred two billion, one million, eighty-seven thousand, seven hundred twenty".