76840909 has 8 divisors (see below), whose sum is σ = 80213760. Its totient is φ = 73524000.

The previous prime is 76840903. The next prime is 76840927. The reversal of 76840909 is 90904867.

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 76840909 - 2⁵ = 76840877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76840903) 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, 11167 + ... + 16684.

It is an arithmetic number, because the mean of its divisors is an integer number (10026720).

Almost surely, 2^76840909 is an apocalyptic number.

It is an amenable number.

76840909 is a deficient number, since it is larger than the sum of its proper divisors (3372851).

76840909 is a wasteful number, since it uses less digits than its factorization.

76840909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27971.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 76840909 is about 8765.8946491502. The cubic root of 76840909 is about 425.1388870184.

The spelling of 76840909 in words is "seventy-six million, eight hundred forty thousand, nine hundred nine".