77393081 has 8 divisors (see below), whose sum is σ = 80477184. Its totient is φ = 74345760.

The previous prime is 77393059. The next prime is 77393093. The reversal of 77393081 is 18039377.

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 a de Polignac number, because none of the positive numbers 2^k-77393081 is a prime.

It is a super-2 number, since 2×77393081² = 11979377973345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77393021) 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, 4865 + ... + 13358.

It is an arithmetic number, because the mean of its divisors is an integer number (10059648).

Almost surely, 2^77393081 is an apocalyptic number.

It is an amenable number.

77393081 is a deficient number, since it is larger than the sum of its proper divisors (3084103).

77393081 is a wasteful number, since it uses less digits than its factorization.

77393081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18391.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 77393081 is about 8797.3337438112. Note that the first 3 decimals coincide. The cubic root of 77393081 is about 426.1547943415.

The spelling of 77393081 in words is "seventy-seven million, three hundred ninety-three thousand, eighty-one".