76989761 has 4 divisors (see below), whose sum is σ = 78442452. Its totient is φ = 75537072.

The previous prime is 76989739. The next prime is 76989791. The reversal of 76989761 is 16798967.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16798967 = 419 ⋅40093.

It can be written as a sum of positive squares in 2 ways, for example, as 28826161 + 48163600 = 5369^2 + 6940^2 .

It is a cyclic number.

It is not a de Polignac number, because 76989761 - 2⁶ = 76989697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1452637 = 76989761 / (7 + 6 + 9 + 8 + 9 + 7 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76989701) 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 3 ways as a sum of consecutive naturals, for example, 726266 + ... + 726371.

It is an arithmetic number, because the mean of its divisors is an integer number (19610613).

Almost surely, 2^76989761 is an apocalyptic number.

It is an amenable number.

76989761 is a deficient number, since it is larger than the sum of its proper divisors (1452691).

76989761 is a wasteful number, since it uses less digits than its factorization.

76989761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452690.

The product of its digits is 1143072, while the sum is 53.

The square root of 76989761 is about 8774.3809468247. The cubic root of 76989761 is about 425.4132285365.

The spelling of 76989761 in words is "seventy-six million, nine hundred eighty-nine thousand, seven hundred sixty-one".