65421245 has 8 divisors (see below), whose sum is σ = 81212760. Its totient is φ = 50532160.

The previous prime is 65421229. The next prime is 65421247. The reversal of 65421245 is 54212456.

It can be written as a sum of positive squares in 4 ways, for example, as 16826404 + 48594841 = 4102^2 + 6971^2 .

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

It is not a de Polignac number, because 65421245 - 2⁴ = 65421229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225446 + ... + 225735.

It is an arithmetic number, because the mean of its divisors is an integer number (10151595).

Almost surely, 2^65421245 is an apocalyptic number.

It is an amenable number.

65421245 is a deficient number, since it is larger than the sum of its proper divisors (15791515).

65421245 is a wasteful number, since it uses less digits than its factorization.

65421245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451215.

The product of its digits is 9600, while the sum is 29.

The square root of 65421245 is about 8088.3400645621. The cubic root of 65421245 is about 402.9392758245.

The spelling of 65421245 in words is "sixty-five million, four hundred twenty-one thousand, two hundred forty-five".