78811884 has 18 divisors (see below), whose sum is σ = 199219020. Its totient is φ = 26270616.

The previous prime is 78811871. The next prime is 78811897. The reversal of 78811884 is 48811887.

It is an interprime number because it is at equal distance from previous prime (78811871) and next prime (78811897).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78811884² = 12422626119258912, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 1094574 + ... + 1094645.

Almost surely, 2^78811884 is an apocalyptic number.

It is an amenable number.

78811884 is an abundant number, since it is smaller than the sum of its proper divisors (120407136).

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

78811884 is a wasteful number, since it uses less digits than its factorization.

78811884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189229 (or 2189224 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 78811884 is about 8877.6057583112. The cubic root of 78811884 is about 428.7431915326.

The spelling of 78811884 in words is "seventy-eight million, eight hundred eleven thousand, eight hundred eighty-four".