78811836 has 12 divisors (see below), whose sum is σ = 183894312. Its totient is φ = 26270608.

The previous prime is 78811807. The next prime is 78811841. The reversal of 78811836 is 63811887.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78811836² = 12422610987381792, which contains 22 as substring.

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, 3283815 + ... + 3283838.

It is an arithmetic number, because the mean of its divisors is an integer number (15324526).

Almost surely, 2^78811836 is an apocalyptic number.

It is an amenable number.

78811836 is an abundant number, since it is smaller than the sum of its proper divisors (105082476).

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

78811836 is a wasteful number, since it uses less digits than its factorization.

78811836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567660 (or 6567658 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 78811836 is about 8877.6030548792. The cubic root of 78811836 is about 428.7431044912.

The spelling of 78811836 in words is "seventy-eight million, eight hundred eleven thousand, eight hundred thirty-six".