77681237 has 8 divisors (see below), whose sum is σ = 78436512. Its totient is φ = 76930000.

The previous prime is 77681231. The next prime is 77681249. The reversal of 77681237 is 73218677.

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

It is a cyclic number.

It is not a de Polignac number, because 77681237 - 2⁶ = 77681173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77681194 and 77681203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681231) 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 7 ways as a sum of consecutive naturals, for example, 48662 + ... + 50232.

It is an arithmetic number, because the mean of its divisors is an integer number (9804564).

Almost surely, 2^77681237 is an apocalyptic number.

It is an amenable number.

77681237 is a deficient number, since it is larger than the sum of its proper divisors (755275).

77681237 is a wasteful number, since it uses less digits than its factorization.

77681237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019.

The product of its digits is 98784, while the sum is 41.

The square root of 77681237 is about 8813.6959897650. The cubic root of 77681237 is about 426.6830369560.

The spelling of 77681237 in words is "seventy-seven million, six hundred eighty-one thousand, two hundred thirty-seven".