77805061 has 4 divisors (see below), whose sum is σ = 77826112. Its totient is φ = 77784012.

The previous prime is 77805059. The next prime is 77805109. The reversal of 77805061 is 16050877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77805061 - 2¹ = 77805059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77805041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 12916.

It is an arithmetic number, because the mean of its divisors is an integer number (19456528).

Almost surely, 2^77805061 is an apocalyptic number.

It is an amenable number.

77805061 is a deficient number, since it is larger than the sum of its proper divisors (21051).

77805061 is a wasteful number, since it uses less digits than its factorization.

77805061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21050.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 77805061 is about 8820.7177145627. The cubic root of 77805061 is about 426.9096277217.

The spelling of 77805061 in words is "seventy-seven million, eight hundred five thousand, sixty-one".