78228711 has 12 divisors (see below), whose sum is σ = 123269640. Its totient is φ = 47411280.

The previous prime is 78228707. The next prime is 78228737. The reversal of 78228711 is 11782287.

It is a happy number.

It is not a de Polignac number, because 78228711 - 2² = 78228707 is a prime.

It is a super-2 number, since 2×78228711² = 12239462449443042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78228701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394996 + ... + 395193.

It is an arithmetic number, because the mean of its divisors is an integer number (10272470).

Almost surely, 2^78228711 is an apocalyptic number.

78228711 is a deficient number, since it is larger than the sum of its proper divisors (45040929).

78228711 is a wasteful number, since it uses less digits than its factorization.

78228711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790206 (or 790203 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 78228711 is about 8844.6995991950. The cubic root of 78228711 is about 427.6830692279.

The spelling of 78228711 in words is "seventy-eight million, two hundred twenty-eight thousand, seven hundred eleven".