77873309 has 8 divisors (see below), whose sum is σ = 80672760. Its totient is φ = 75116800.

The previous prime is 77873293. The next prime is 77873321. The reversal of 77873309 is 90337877.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6943225 + 70930084 = 2635^2 + 8422^2 .

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 77873309 - 2⁴ = 77873293 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 77873309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77873329) 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, 7022 + ... + 14319.

It is an arithmetic number, because the mean of its divisors is an integer number (10084095).

Almost surely, 2^77873309 is an apocalyptic number.

It is an amenable number.

77873309 is a deficient number, since it is larger than the sum of its proper divisors (2799451).

77873309 is a wasteful number, since it uses less digits than its factorization.

77873309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21471.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 77873309 is about 8824.5854860158. The cubic root of 77873309 is about 427.0344148632.

The spelling of 77873309 in words is "seventy-seven million, eight hundred seventy-three thousand, three hundred nine".