77648881 has 8 divisors (see below), whose sum is σ = 78534144. Its totient is φ = 76768800.

The previous prime is 77648873. The next prime is 77648887. The reversal of 77648881 is 18884677.

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 77648881 - 2³ = 77648873 is a prime.

It is a super-2 number, since 2×77648881² = 12058697441104322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77648887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34080 + ... + 36286.

It is an arithmetic number, because the mean of its divisors is an integer number (9816768).

Almost surely, 2^77648881 is an apocalyptic number.

It is an amenable number.

77648881 is a deficient number, since it is larger than the sum of its proper divisors (885263).

77648881 is a wasteful number, since it uses less digits than its factorization.

77648881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591.

The product of its digits is 602112, while the sum is 49.

The square root of 77648881 is about 8811.8602462817. The cubic root of 77648881 is about 426.6237876695.

The spelling of 77648881 in words is "seventy-seven million, six hundred forty-eight thousand, eight hundred eighty-one".