64219849 has 4 divisors (see below), whose sum is σ = 64591236. Its totient is φ = 63848464.

The previous prime is 64219843. The next prime is 64219853. The reversal of 64219849 is 94891246.

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 32410249 + 31809600 = 5693^2 + 5640^2 .

It is a cyclic number.

It is not a de Polignac number, because 64219849 - 2¹³ = 64211657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64219843) 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, 185434 + ... + 185779.

It is an arithmetic number, because the mean of its divisors is an integer number (16147809).

Almost surely, 2^64219849 is an apocalyptic number.

It is an amenable number.

64219849 is a deficient number, since it is larger than the sum of its proper divisors (371387).

64219849 is a wasteful number, since it uses less digits than its factorization.

64219849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371386.

The product of its digits is 124416, while the sum is 43.

The square root of 64219849 is about 8013.7287825331. The cubic root of 64219849 is about 400.4574952956.

The spelling of 64219849 in words is "sixty-four million, two hundred nineteen thousand, eight hundred forty-nine".