102509820 has 192 divisors, whose sum is σ = 372879360. Its totient is φ = 22892544.

The previous prime is 102509819. The next prime is 102509837. The reversal of 102509820 is 28905201.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 177372 + ... + 177948.

It is an arithmetic number, because the mean of its divisors is an integer number (1942080).

Almost surely, 2^102509820 is an apocalyptic number.

102509820 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 102509820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186439680).

102509820 is an abundant number, since it is smaller than the sum of its proper divisors (270369540).

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

102509820 is a wasteful number, since it uses less digits than its factorization.

102509820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 102509820 is about 10124.7133292751. The cubic root of 102509820 is about 468.0100260837.

The spelling of 102509820 in words is "one hundred two million, five hundred nine thousand, eight hundred twenty".