65820249 has 24 divisors (see below), whose sum is σ = 107187360. Its totient is φ = 39889080.

The previous prime is 65820203. The next prime is 65820263. The reversal of 65820249 is 94202856.

It is a happy number.

It is not a de Polignac number, because 65820249 - 2⁸ = 65819993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65820049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6807 + ... + 13340.

It is an arithmetic number, because the mean of its divisors is an integer number (4466140).

Almost surely, 2^65820249 is an apocalyptic number.

It is an amenable number.

65820249 is a deficient number, since it is larger than the sum of its proper divisors (41367111).

65820249 is a wasteful number, since it uses less digits than its factorization.

65820249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20178 (or 20161 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 65820249 is about 8112.9679526053. The cubic root of 65820249 is about 403.7567912541.

The spelling of 65820249 in words is "sixty-five million, eight hundred twenty thousand, two hundred forty-nine".