77993009 has 4 divisors (see below), whose sum is σ = 78012480. Its totient is φ = 77973540.

The previous prime is 77992997. The next prime is 77993011. The reversal of 77993009 is 90039977.

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 a de Polignac number, because none of the positive numbers 2^k-77993009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77993089) 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, 1277 + ... + 12554.

It is an arithmetic number, because the mean of its divisors is an integer number (19503120).

Almost surely, 2^77993009 is an apocalyptic number.

It is an amenable number.

77993009 is a deficient number, since it is larger than the sum of its proper divisors (19471).

77993009 is a wasteful number, since it uses less digits than its factorization.

77993009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19470.

The product of its (nonzero) digits is 107163, while the sum is 44.

The square root of 77993009 is about 8831.3650700217. The cubic root of 77993009 is about 427.2531027641.

The spelling of 77993009 in words is "seventy-seven million, nine hundred ninety-three thousand, nine".