77820011 has 4 divisors (see below), whose sum is σ = 77897400. Its totient is φ = 77742624.

The previous prime is 77820007. The next prime is 77820019. The reversal of 77820011 is 11002877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11002877 = 673 ⋅16349.

It is a cyclic number.

It is not a de Polignac number, because 77820011 - 2² = 77820007 is a prime.

It is a super-2 number, since 2×77820011² = 12111908224080242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77820019) 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 3 ways as a sum of consecutive naturals, for example, 37166 + ... + 39203.

It is an arithmetic number, because the mean of its divisors is an integer number (19474350).

Almost surely, 2^77820011 is an apocalyptic number.

77820011 is a deficient number, since it is larger than the sum of its proper divisors (77389).

77820011 is a wasteful number, since it uses less digits than its factorization.

77820011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77388.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 77820011 is about 8821.5651105685. The cubic root of 77820011 is about 426.9369690888.

Adding to 77820011 its reverse (11002877), we get a palindrome (88822888).

The spelling of 77820011 in words is "seventy-seven million, eight hundred twenty thousand, eleven".