76677781 has 4 divisors (see below), whose sum is σ = 76696192. Its totient is φ = 76659372.

The previous prime is 76677779. The next prime is 76677817. The reversal of 76677781 is 18777667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18777667 = 227 ⋅82721.

It is a cyclic number.

It is not a de Polignac number, because 76677781 - 2¹ = 76677779 is a prime.

It is a super-2 number, since 2×76677781² = 11758964198167922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76677721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346 + ... + 12388.

It is an arithmetic number, because the mean of its divisors is an integer number (19174048).

Almost surely, 2^76677781 is an apocalyptic number.

It is an amenable number.

76677781 is a deficient number, since it is larger than the sum of its proper divisors (18411).

76677781 is a wasteful number, since it uses less digits than its factorization.

76677781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18410.

The product of its digits is 691488, while the sum is 49.

The square root of 76677781 is about 8756.5850078669. The cubic root of 76677781 is about 424.8378269373.

The spelling of 76677781 in words is "seventy-six million, six hundred seventy-seven thousand, seven hundred eighty-one".