102720144 has 20 divisors (see below), whose sum is σ = 265360496. Its totient is φ = 34240032.

The previous prime is 102720133. The next prime is 102720181. The reversal of 102720144 is 441027201.

It is a happy number.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 102720144.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069954 + ... + 1070049.

Almost surely, 2^102720144 is an apocalyptic number.

It is an amenable number.

102720144 is an abundant number, since it is smaller than the sum of its proper divisors (162640352).

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

102720144 is a wasteful number, since it uses less digits than its factorization.

102720144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140014 (or 2140008 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 102720144 is about 10135.0946714868. The cubic root of 102720144 is about 468.3298864868.

Adding to 102720144 its reverse (441027201), we get a palindrome (543747345).

The spelling of 102720144 in words is "one hundred two million, seven hundred twenty thousand, one hundred forty-four".