65421385 has 8 divisors (see below), whose sum is σ = 78606216. Its totient is φ = 52270080.

The previous prime is 65421373. The next prime is 65421397. The reversal of 65421385 is 58312456.

It is an interprime number because it is at equal distance from previous prime (65421373) and next prime (65421397).

It can be written as a sum of positive squares in 4 ways, for example, as 5992704 + 59428681 = 2448^2 + 7709^2 .

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

It is not a de Polignac number, because 65421385 - 2⁵ = 65421353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65421385.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3864 + ... + 12073.

It is an arithmetic number, because the mean of its divisors is an integer number (9825777).

Almost surely, 2^65421385 is an apocalyptic number.

It is an amenable number.

65421385 is a deficient number, since it is larger than the sum of its proper divisors (13184831).

65421385 is a wasteful number, since it uses less digits than its factorization.

65421385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16763.

The product of its digits is 28800, while the sum is 34.

The square root of 65421385 is about 8088.3487189908. The cubic root of 65421385 is about 402.9395632513.

The spelling of 65421385 in words is "sixty-five million, four hundred twenty-one thousand, three hundred eighty-five".