77132861 has 8 divisors (see below), whose sum is σ = 84634200. Its totient is φ = 69855552.

The previous prime is 77132843. The next prime is 77132873. The reversal of 77132861 is 16823177.

77132861 = 27⁴ + 28⁴ + ... + 52⁴.

It can be written as a sum of positive squares in 4 ways, for example, as 219961 + 76912900 = 469^2 + 8770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77132861 - 2¹⁰ = 77131837 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 (77132821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55286 + ... + 56663.

It is an arithmetic number, because the mean of its divisors is an integer number (10579275).

Almost surely, 2^77132861 is an apocalyptic number.

It is an amenable number.

77132861 is a deficient number, since it is larger than the sum of its proper divisors (7501339).

77132861 is a wasteful number, since it uses less digits than its factorization.

77132861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112015.

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

The square root of 77132861 is about 8782.5315826361. The cubic root of 77132861 is about 425.6766356624.

The spelling of 77132861 in words is "seventy-seven million, one hundred thirty-two thousand, eight hundred sixty-one".