77741861 has 4 divisors (see below), whose sum is σ = 78806892. Its totient is φ = 76676832.

The previous prime is 77741849. The next prime is 77741879. The reversal of 77741861 is 16814777.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45819361 + 31922500 = 6769^2 + 5650^2 .

It is a cyclic number.

It is not a de Polignac number, because 77741861 - 2²² = 73547557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77741801) 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, 532406 + ... + 532551.

It is an arithmetic number, because the mean of its divisors is an integer number (19701723).

Almost surely, 2^77741861 is an apocalyptic number.

It is an amenable number.

77741861 is a deficient number, since it is larger than the sum of its proper divisors (1065031).

77741861 is a wasteful number, since it uses less digits than its factorization.

77741861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065030.

The product of its digits is 65856, while the sum is 41.

The square root of 77741861 is about 8817.1345118468. The cubic root of 77741861 is about 426.7940054354.

The spelling of 77741861 in words is "seventy-seven million, seven hundred forty-one thousand, eight hundred sixty-one".