65231985 has 48 divisors (see below), whose sum is σ = 130769856. Its totient is φ = 27522432.

The previous prime is 65231977. The next prime is 65231987. The reversal of 65231985 is 58913256.

It is not a de Polignac number, because 65231985 - 2³ = 65231977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (65231987) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6142 + ... + 12968.

It is an arithmetic number, because the mean of its divisors is an integer number (2724372).

Almost surely, 2^65231985 is an apocalyptic number.

65231985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65231985 is an abundant number, since it is smaller than the sum of its proper divisors (65537871).

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

65231985 is a wasteful number, since it uses less digits than its factorization.

65231985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6862 (or 6855 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 65231985 is about 8076.6320332178. The cubic root of 65231985 is about 402.5503402696.

The spelling of 65231985 in words is "sixty-five million, two hundred thirty-one thousand, nine hundred eighty-five".