76828809 has 8 divisors (see below), whose sum is σ = 106892352. Its totient is φ = 48992240.

The previous prime is 76828783. The next prime is 76828811. The reversal of 76828809 is 90882867.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76828809 - 2⁸ = 76828553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76828849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556662 + ... + 556799.

It is an arithmetic number, because the mean of its divisors is an integer number (13361544).

Almost surely, 2^76828809 is an apocalyptic number.

It is an amenable number.

76828809 is a deficient number, since it is larger than the sum of its proper divisors (30063543).

76828809 is a wasteful number, since it uses less digits than its factorization.

76828809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113487.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 76828809 is about 8765.2044471307. The cubic root of 76828809 is about 425.1165705612.

The spelling of 76828809 in words is "seventy-six million, eight hundred twenty-eight thousand, eight hundred nine".