102878605 has 4 divisors (see below), whose sum is σ = 123454332. Its totient is φ = 82302880.

The previous prime is 102878593. The next prime is 102878617. The reversal of 102878605 is 506878201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (102878593) and next prime (102878617).

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 85414564 = 4179^2 + 9242^2 .

It is not a de Polignac number, because 102878605 - 2¹³ = 102870413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10287856 + ... + 10287865.

It is an arithmetic number, because the mean of its divisors is an integer number (30863583).

Almost surely, 2^102878605 is an apocalyptic number.

It is an amenable number.

102878605 is a deficient number, since it is larger than the sum of its proper divisors (20575727).

102878605 is an equidigital number, since it uses as much as digits as its factorization.

102878605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20575726.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 102878605 is about 10142.9090994645. The cubic root of 102878605 is about 468.5705854414.

The spelling of 102878605 in words is "one hundred two million, eight hundred seventy-eight thousand, six hundred five".