64349621 has 4 divisors (see below), whose sum is σ = 73542432. Its totient is φ = 55156812.

The previous prime is 64349617. The next prime is 64349639. The reversal of 64349621 is 12694346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64349621 - 2² = 64349617 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 (64349611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4596395 + ... + 4596408.

It is an arithmetic number, because the mean of its divisors is an integer number (18385608).

Almost surely, 2^64349621 is an apocalyptic number.

It is an amenable number.

64349621 is a deficient number, since it is larger than the sum of its proper divisors (9192811).

64349621 is an equidigital number, since it uses as much as digits as its factorization.

64349621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9192810.

The product of its digits is 31104, while the sum is 35.

The square root of 64349621 is about 8021.8215512438. The cubic root of 64349621 is about 400.7270547611.

The spelling of 64349621 in words is "sixty-four million, three hundred forty-nine thousand, six hundred twenty-one".