76879781 has 4 divisors (see below), whose sum is σ = 83868864. Its totient is φ = 69890700.

The previous prime is 76879769. The next prime is 76879787. The reversal of 76879781 is 18797867.

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 76879781 - 2⁶ = 76879717 is a prime.

It is a super-2 number, since 2×76879781² = 11821001453215922, 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 (76879787) 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 3 ways as a sum of consecutive naturals, for example, 3494525 + ... + 3494546.

It is an arithmetic number, because the mean of its divisors is an integer number (20967216).

Almost surely, 2^76879781 is an apocalyptic number.

It is an amenable number.

76879781 is a deficient number, since it is larger than the sum of its proper divisors (6989083).

76879781 is a wasteful number, since it uses less digits than its factorization.

76879781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989082.

The product of its digits is 1185408, while the sum is 53.

The square root of 76879781 is about 8768.1115982861. Note that the first 3 decimals coincide. The cubic root of 76879781 is about 425.2105641719.

The spelling of 76879781 in words is "seventy-six million, eight hundred seventy-nine thousand, seven hundred eighty-one".