76679989 has 4 divisors (see below), whose sum is σ = 77937100. Its totient is φ = 75422880.

The previous prime is 76679987. The next prime is 76680011. The reversal of 76679989 is 98997667.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12006225 + 64673764 = 3465^2 + 8042^2 .

It is a cyclic number.

It is not a de Polignac number, because 76679989 - 2¹ = 76679987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 1257049 = 76679989 / (7 + 6 + 6 + 7 + 9 + 9 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76679987) 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, 628464 + ... + 628585.

It is an arithmetic number, because the mean of its divisors is an integer number (19484275).

Almost surely, 2^76679989 is an apocalyptic number.

It is an amenable number.

76679989 is a deficient number, since it is larger than the sum of its proper divisors (1257111).

76679989 is a wasteful number, since it uses less digits than its factorization.

76679989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257110.

The product of its digits is 10287648, while the sum is 61.

The square root of 76679989 is about 8756.7110835062. The cubic root of 76679989 is about 424.8419047501.

The spelling of 76679989 in words is "seventy-six million, six hundred seventy-nine thousand, nine hundred eighty-nine".