64821461 has 4 divisors (see below), whose sum is σ = 64906092. Its totient is φ = 64736832.

The previous prime is 64821457. The next prime is 64821487. The reversal of 64821461 is 16412846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14326225 + 50495236 = 3785^2 + 7106^2 .

It is a cyclic number.

It is not a de Polignac number, because 64821461 - 2² = 64821457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64821401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41156 + ... + 42701.

It is an arithmetic number, because the mean of its divisors is an integer number (16226523).

Almost surely, 2^64821461 is an apocalyptic number.

It is an amenable number.

64821461 is a deficient number, since it is larger than the sum of its proper divisors (84631).

64821461 is an equidigital number, since it uses as much as digits as its factorization.

64821461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84630.

The product of its digits is 9216, while the sum is 32.

The square root of 64821461 is about 8051.1776157280. The cubic root of 64821461 is about 401.7041068234.

The spelling of 64821461 in words is "sixty-four million, eight hundred twenty-one thousand, four hundred sixty-one".