76987909 has 4 divisors (see below), whose sum is σ = 77202720. Its totient is φ = 76773100.

The previous prime is 76987907. The next prime is 76987961. The reversal of 76987909 is 90978967.

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: 90978967 = 37 ⋅2458891.

It is a cyclic number.

It is not a de Polignac number, because 76987909 - 2¹ = 76987907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76987909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76987901) 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, 106867 + ... + 107584.

It is an arithmetic number, because the mean of its divisors is an integer number (19300680).

Almost surely, 2^76987909 is an apocalyptic number.

It is an amenable number.

76987909 is a deficient number, since it is larger than the sum of its proper divisors (214811).

76987909 is a wasteful number, since it uses less digits than its factorization.

76987909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214810.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 76987909 is about 8774.2754116793. The cubic root of 76987909 is about 425.4098173833.

The spelling of 76987909 in words is "seventy-six million, nine hundred eighty-seven thousand, nine hundred nine".