102688138 has 16 divisors (see below), whose sum is σ = 179783424. Its totient is φ = 43072560.

The previous prime is 102688121. The next prime is 102688139. The reversal of 102688138 is 831886201.

It is a junction number, because it is equal to n+sod(n) for n = 102688097 and 102688106.

It is not an unprimeable number, because it can be changed into a prime (102688139) 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, 77373 + ... + 78688.

It is an arithmetic number, because the mean of its divisors is an integer number (11236464).

Almost surely, 2^102688138 is an apocalyptic number.

102688138 is a deficient number, since it is larger than the sum of its proper divisors (77095286).

102688138 is a wasteful number, since it uses less digits than its factorization.

102688138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156117.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 102688138 is about 10133.5155795015. The cubic root of 102688138 is about 468.2812399966.

The spelling of 102688138 in words is "one hundred two million, six hundred eighty-eight thousand, one hundred thirty-eight".