77985447 has 8 divisors (see below), whose sum is σ = 104035056. Its totient is φ = 51963072.

The previous prime is 77985407. The next prime is 77985451. The reversal of 77985447 is 74458977.

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

It is not a de Polignac number, because 77985447 - 2⁷ = 77985319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77985447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77985407) 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, 1233 + ... + 12549.

It is an arithmetic number, because the mean of its divisors is an integer number (13004382).

Almost surely, 2^77985447 is an apocalyptic number.

77985447 is a deficient number, since it is larger than the sum of its proper divisors (26049609).

77985447 is a wasteful number, since it uses less digits than its factorization.

77985447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13617.

The product of its digits is 1975680, while the sum is 51.

The square root of 77985447 is about 8830.9369265101. The cubic root of 77985447 is about 427.2392938667.

The spelling of 77985447 in words is "seventy-seven million, nine hundred eighty-five thousand, four hundred forty-seven".