78533811 has 6 divisors (see below), whose sum is σ = 113437740. Its totient is φ = 52355868.

The previous prime is 78533801. The next prime is 78533813. The reversal of 78533811 is 11833587.

It is not a de Polignac number, because 78533811 - 2⁶ = 78533747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78533813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4362981 + ... + 4362998.

It is an arithmetic number, because the mean of its divisors is an integer number (18906290).

Almost surely, 2^78533811 is an apocalyptic number.

78533811 is a deficient number, since it is larger than the sum of its proper divisors (34903929).

78533811 is a wasteful number, since it uses less digits than its factorization.

78533811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8725985 (or 8725982 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 78533811 is about 8861.9304330377. The cubic root of 78533811 is about 428.2383505858.

It can be divided in two parts, 7853 and 3811, that added together give a square (11664 = 108²).

The spelling of 78533811 in words is "seventy-eight million, five hundred thirty-three thousand, eight hundred eleven".