78888869 has 4 divisors (see below), whose sum is σ = 79146144. Its totient is φ = 78631596.

The previous prime is 78888863. The next prime is 78888871. The reversal of 78888869 is 96888887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78888869 - 2¹⁶ = 78823333 is a prime.

It is a super-2 number, since 2×78888869² = 12446907304198322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78888863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128177 + ... + 128790.

It is an arithmetic number, because the mean of its divisors is an integer number (19786536).

Almost surely, 2^78888869 is an apocalyptic number.

It is an amenable number.

78888869 is a deficient number, since it is larger than the sum of its proper divisors (257275).

78888869 is a wasteful number, since it uses less digits than its factorization.

78888869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257274.

The product of its digits is 12386304, while the sum is 62.

The square root of 78888869 is about 8881.9406100244. The cubic root of 78888869 is about 428.8827476990.

The spelling of 78888869 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred sixty-nine".