69431985 has 80 divisors (see below), whose sum is σ = 149846400. Its totient is φ = 30046464.

The previous prime is 69431981. The next prime is 69432001. The reversal of 69431985 is 58913496.

It is a happy number.

It is not a de Polignac number, because 69431985 - 2² = 69431981 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 69431985.

It is not an unprimeable number, because it can be changed into a prime (69431981) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 53221 + ... + 54509.

It is an arithmetic number, because the mean of its divisors is an integer number (1873080).

Almost surely, 2^69431985 is an apocalyptic number.

It is an amenable number.

69431985 is an abundant number, since it is smaller than the sum of its proper divisors (80414415).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

69431985 is a wasteful number, since it uses less digits than its factorization.

69431985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332 (or 1323 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 69431985 is about 8332.5857331323. The cubic root of 69431985 is about 411.0107621456.

The spelling of 69431985 in words is "sixty-nine million, four hundred thirty-one thousand, nine hundred eighty-five".