64940219 has 4 divisors (see below), whose sum is σ = 65909544. Its totient is φ = 63970896.

The previous prime is 64940209. The next prime is 64940243. The reversal of 64940219 is 91204946.

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

It is a cyclic number.

It is not a de Polignac number, because 64940219 - 2²⁰ = 63891643 is a prime.

It is a super-2 number, since 2×64940219² = 8434464087535922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64940209) 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, 484562 + ... + 484695.

It is an arithmetic number, because the mean of its divisors is an integer number (16477386).

Almost surely, 2^64940219 is an apocalyptic number.

64940219 is a deficient number, since it is larger than the sum of its proper divisors (969325).

64940219 is an equidigital number, since it uses as much as digits as its factorization.

64940219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969324.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 64940219 is about 8058.5494352272. The cubic root of 64940219 is about 401.9492749706.

The spelling of 64940219 in words is "sixty-four million, nine hundred forty thousand, two hundred nineteen".