77871009 has 8 divisors (see below), whose sum is σ = 103872352. Its totient is φ = 51891840.

The previous prime is 77871007. The next prime is 77871019. The reversal of 77871009 is 90017877.

It is a happy number.

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

It is not a de Polignac number, because 77871009 - 2¹ = 77871007 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77871007) 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, 6222 + ... + 13944.

It is an arithmetic number, because the mean of its divisors is an integer number (12984044).

Almost surely, 2^77871009 is an apocalyptic number.

It is an amenable number.

77871009 is a deficient number, since it is larger than the sum of its proper divisors (26001343).

77871009 is a wasteful number, since it uses less digits than its factorization.

77871009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11087.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 77871009 is about 8824.4551673177. The cubic root of 77871009 is about 427.0302106464.

The spelling of 77871009 in words is "seventy-seven million, eight hundred seventy-one thousand, nine".