78102 has 12 divisors (see below), whose sum is σ = 169260. Its totient is φ = 26028.

The previous prime is 78101. The next prime is 78121. The reversal of 78102 is 20187.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 4339 = 78102 / (7 + 8 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2152 + ... + 2187.

It is an arithmetic number, because the mean of its divisors is an integer number (14105).

2⁷⁸¹⁰² is an apocalyptic number.

78102 is an abundant number, since it is smaller than the sum of its proper divisors (91158).

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

78102 is a wasteful number, since it uses less digits than its factorization.

78102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4347 (or 4344 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 78102 is about 279.4673505081. The cubic root of 78102 is about 42.7452031142.

Adding to 78102 its reverse (20187), we get a palindrome (98289).

The spelling of 78102 in words is "seventy-eight thousand, one hundred two".