77682881 has 8 divisors (see below), whose sum is σ = 79254240. Its totient is φ = 76120128.

The previous prime is 77682853. The next prime is 77682901. The reversal of 77682881 is 18828677.

It is a happy number.

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 77682881 - 2²² = 73488577 is a prime.

It is a super-2 number, since 2×77682881² = 12069260000920322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77682821) 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, 17930 + ... + 21836.

It is an arithmetic number, because the mean of its divisors is an integer number (9906780).

Almost surely, 2^77682881 is an apocalyptic number.

It is an amenable number.

77682881 is a deficient number, since it is larger than the sum of its proper divisors (1571359).

77682881 is a wasteful number, since it uses less digits than its factorization.

77682881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303.

The product of its digits is 301056, while the sum is 47.

The square root of 77682881 is about 8813.7892532100. The cubic root of 77682881 is about 426.6860469577.

The spelling of 77682881 in words is "seventy-seven million, six hundred eighty-two thousand, eight hundred eighty-one".