102215620 has 24 divisors (see below), whose sum is σ = 231165144. Its totient is φ = 37741056.

The previous prime is 102215599. The next prime is 102215621. The reversal of 102215620 is 26512201.

It can be written as a sum of positive squares in 4 ways, for example, as 246016 + 101969604 = 496^2 + 10098^2 .

It is not an unprimeable number, because it can be changed into a prime (102215621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196309 + ... + 196828.

It is an arithmetic number, because the mean of its divisors is an integer number (9631881).

Almost surely, 2^102215620 is an apocalyptic number.

102215620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102215620 is an abundant number, since it is smaller than the sum of its proper divisors (128949524).

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

102215620 is a wasteful number, since it uses less digits than its factorization.

102215620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393159 (or 393157 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 102215620 is about 10110.1740835655. The cubic root of 102215620 is about 467.5618723338.

Adding to 102215620 its reverse (26512201), we get a palindrome (128727821).

The spelling of 102215620 in words is "one hundred two million, two hundred fifteen thousand, six hundred twenty".