76865509 has 4 divisors (see below), whose sum is σ = 87846304. Its totient is φ = 65884716.

The previous prime is 76865491. The next prime is 76865513. The reversal of 76865509 is 90556867.

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 a cyclic number.

It is not a de Polignac number, because 76865509 - 2¹¹ = 76863461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76865519) 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, 5490387 + ... + 5490400.

It is an arithmetic number, because the mean of its divisors is an integer number (21961576).

Almost surely, 2^76865509 is an apocalyptic number.

It is an amenable number.

76865509 is a deficient number, since it is larger than the sum of its proper divisors (10980795).

76865509 is a wasteful number, since it uses less digits than its factorization.

76865509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10980794.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 76865509 is about 8767.2977022570. The cubic root of 76865509 is about 425.1842504448.

The spelling of 76865509 in words is "seventy-six million, eight hundred sixty-five thousand, five hundred nine".