76681381 has 4 divisors (see below), whose sum is σ = 87635872. Its totient is φ = 65726892.

The previous prime is 76681369. The next prime is 76681399. The reversal of 76681381 is 18318667.

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.

It is not a de Polignac number, because 76681381 - 2²¹ = 74584229 is a prime.

It is a super-2 number, since 2×76681381² = 11760068384134322, 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 (76681351) 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, 5477235 + ... + 5477248.

It is an arithmetic number, because the mean of its divisors is an integer number (21908968).

Almost surely, 2^76681381 is an apocalyptic number.

It is an amenable number.

76681381 is a deficient number, since it is larger than the sum of its proper divisors (10954491).

76681381 is a wasteful number, since it uses less digits than its factorization.

76681381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10954490.

The product of its digits is 48384, while the sum is 40.

The square root of 76681381 is about 8756.7905650415. The cubic root of 76681381 is about 424.8444755049.

The spelling of 76681381 in words is "seventy-six million, six hundred eighty-one thousand, three hundred eighty-one".