102720420 has 96 divisors (see below), whose sum is σ = 348647040. Its totient is φ = 24900480.

The previous prime is 102720383. The next prime is 102720439. The reversal of 102720420 is 24027201.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 102720393 and 102720402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2707 + ... + 14586.

It is an arithmetic number, because the mean of its divisors is an integer number (3631740).

Almost surely, 2^102720420 is an apocalyptic number.

102720420 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 102720420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174323520).

102720420 is an abundant number, since it is smaller than the sum of its proper divisors (245926620).

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

102720420 is a wasteful number, since it uses less digits than its factorization.

102720420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17322 (or 17314 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 102720420 is about 10135.1082875320. The cubic root of 102720420 is about 468.3303059402.

Adding to 102720420 its reverse (24027201), we get a palindrome (126747621).

The spelling of 102720420 in words is "one hundred two million, seven hundred twenty thousand, four hundred twenty".