102809144 has 16 divisors (see below), whose sum is σ = 198985920. Its totient is φ = 49746240.

The previous prime is 102809143. The next prime is 102809191. The reversal of 102809144 is 441908201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102809143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207029 + ... + 207524.

It is an arithmetic number, because the mean of its divisors is an integer number (12436620).

Almost surely, 2^102809144 is an apocalyptic number.

It is an amenable number.

102809144 is a deficient number, since it is larger than the sum of its proper divisors (96176776).

102809144 is a wasteful number, since it uses less digits than its factorization.

102809144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414590 (or 414586 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 102809144 is about 10139.4844050376. The cubic root of 102809144 is about 468.4651060781.

The spelling of 102809144 in words is "one hundred two million, eight hundred nine thousand, one hundred forty-four".