76921009 has 8 divisors (see below), whose sum is σ = 84857760. Its totient is φ = 69141600.

The previous prime is 76920983. The next prime is 76921027. The reversal of 76921009 is 90012967.

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

It is not a de Polignac number, because 76921009 - 2⁷ = 76920881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76921069) 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 7 ways as a sum of consecutive naturals, for example, 38307 + ... + 40264.

It is an arithmetic number, because the mean of its divisors is an integer number (10607220).

Almost surely, 2^76921009 is an apocalyptic number.

It is an amenable number.

76921009 is a deficient number, since it is larger than the sum of its proper divisors (7936751).

76921009 is a wasteful number, since it uses less digits than its factorization.

76921009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78671.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 76921009 is about 8770.4623025243. The cubic root of 76921009 is about 425.2865592218.

The spelling of 76921009 in words is "seventy-six million, nine hundred twenty-one thousand, nine".