78082811 has 4 divisors (see below), whose sum is σ = 78131592. Its totient is φ = 78034032.

The previous prime is 78082801. The next prime is 78082891. The reversal of 78082811 is 11828087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78082811 - 2¹⁸ = 77820667 is a prime.

It is a super-3 number, since 3×78082811³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78082801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21905 + ... + 25218.

It is an arithmetic number, because the mean of its divisors is an integer number (19532898).

Almost surely, 2^78082811 is an apocalyptic number.

78082811 is a deficient number, since it is larger than the sum of its proper divisors (48781).

78082811 is a wasteful number, since it uses less digits than its factorization.

78082811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48780.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 78082811 is about 8836.4478723071. The cubic root of 78082811 is about 427.4170211597.

The spelling of 78082811 in words is "seventy-eight million, eighty-two thousand, eight hundred eleven".