77934981 has 8 divisors (see below), whose sum is σ = 104085280. Its totient is φ = 51870672.

The previous prime is 77934959. The next prime is 77934991. The reversal of 77934981 is 18943977.

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

It is not a de Polignac number, because 77934981 - 2¹³ = 77926789 is a prime.

It is a super-2 number, since 2×77934981² = 12147722526940722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77934981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77934911) 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, 19351 + ... + 23028.

It is an arithmetic number, because the mean of its divisors is an integer number (13010660).

Almost surely, 2^77934981 is an apocalyptic number.

It is an amenable number.

77934981 is a deficient number, since it is larger than the sum of its proper divisors (26150299).

77934981 is a wasteful number, since it uses less digits than its factorization.

77934981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42995.

The product of its digits is 381024, while the sum is 48.

The square root of 77934981 is about 8828.0791228896. The cubic root of 77934981 is about 427.1471155113.

The spelling of 77934981 in words is "seventy-seven million, nine hundred thirty-four thousand, nine hundred eighty-one".