77709985 has 8 divisors (see below), whose sum is σ = 97306560. Its totient is φ = 59464944.

The previous prime is 77709967. The next prime is 77709991. The reversal of 77709985 is 58990777.

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 77709985 - 2¹¹ = 77707937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337755 + ... + 337984.

It is an arithmetic number, because the mean of its divisors is an integer number (12163320).

Almost surely, 2^77709985 is an apocalyptic number.

It is an amenable number.

77709985 is a deficient number, since it is larger than the sum of its proper divisors (19596575).

77709985 is a wasteful number, since it uses less digits than its factorization.

77709985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675767.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The square root of 77709985 is about 8815.3267097709. The cubic root of 77709985 is about 426.7356655854.

The spelling of 77709985 in words is "seventy-seven million, seven hundred nine thousand, nine hundred eighty-five".