77600861 has 16 divisors (see below), whose sum is σ = 84967344. Its totient is φ = 70447104.

The previous prime is 77600857. The next prime is 77600867. The reversal of 77600861 is 16800677.

It can be written as a sum of positive squares in 8 ways, for example, as 1038361 + 76562500 = 1019^2 + 8750^2 .

It is not a de Polignac number, because 77600861 - 2² = 77600857 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 (77600867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393815 + ... + 394011.

It is an arithmetic number, because the mean of its divisors is an integer number (5310459).

Almost surely, 2^77600861 is an apocalyptic number.

It is an amenable number.

77600861 is a deficient number, since it is larger than the sum of its proper divisors (7366483).

77600861 is a wasteful number, since it uses less digits than its factorization.

77600861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 77600861 is about 8809.1350880776. The cubic root of 77600861 is about 426.5358246125.

The spelling of 77600861 in words is "seventy-seven million, six hundred thousand, eight hundred sixty-one".