77861943 has 12 divisors (see below), whose sum is σ = 118386840. Its totient is φ = 49175856.

The previous prime is 77861941. The next prime is 77861951. The reversal of 77861943 is 34916877.

It is not a de Polignac number, because 77861943 - 2¹ = 77861941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77861941) 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 11 ways as a sum of consecutive naturals, for example, 227496 + ... + 227837.

It is an arithmetic number, because the mean of its divisors is an integer number (9865570).

Almost surely, 2^77861943 is an apocalyptic number.

77861943 is a deficient number, since it is larger than the sum of its proper divisors (40524897).

77861943 is a wasteful number, since it uses less digits than its factorization.

77861943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455358 (or 455355 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 77861943 is about 8823.9414662610. The cubic root of 77861943 is about 427.0136379141.

The spelling of 77861943 in words is "seventy-seven million, eight hundred sixty-one thousand, nine hundred forty-three".