102720225 has 24 divisors (see below), whose sum is σ = 170565472. Its totient is φ = 54547200.

The previous prime is 102720221. The next prime is 102720229. The reversal of 102720225 is 522027201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102720221) and next prime (102720229).

It is not a de Polignac number, because 102720225 - 2² = 102720221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102720221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15234 + ... + 20916.

Almost surely, 2^102720225 is an apocalyptic number.

102720225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

102720225 is a deficient number, since it is larger than the sum of its proper divisors (67845247).

102720225 is a wasteful number, since it uses less digits than its factorization.

102720225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5937 (or 5932 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 102720225 is about 10135.0986675020. The cubic root of 102720225 is about 468.3300095873.

Adding to 102720225 its reverse (522027201), we get a palindrome (624747426).

The spelling of 102720225 in words is "one hundred two million, seven hundred twenty thousand, two hundred twenty-five".