78811011 has 12 divisors (see below), whose sum is σ = 114135840. Its totient is φ = 52403280.

The previous prime is 78811003. The next prime is 78811027. The reversal of 78811011 is 11011887.

It is not a de Polignac number, because 78811011 - 2³ = 78811003 is a prime.

It is a super-2 number, since 2×78811011² = 12422350909684242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78811001) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 7755 + ... + 14756.

It is an arithmetic number, because the mean of its divisors is an integer number (9511320).

Almost surely, 2^78811011 is an apocalyptic number.

78811011 is a deficient number, since it is larger than the sum of its proper divisors (35324829).

78811011 is a wasteful number, since it uses less digits than its factorization.

78811011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22906 (or 22903 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The square root of 78811011 is about 8877.5565895127. The cubic root of 78811011 is about 428.7416084626.

Adding to 78811011 its reverse (11011887), we get a palindrome (89822898).

The spelling of 78811011 in words is "seventy-eight million, eight hundred eleven thousand, eleven".