64949639 has 4 divisors (see below), whose sum is σ = 68770224. Its totient is φ = 61129056.

The previous prime is 64949627. The next prime is 64949641. The reversal of 64949639 is 93694946.

It is a happy number.

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 64949639 - 2⁴ = 64949623 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 (64949039) 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, 1910267 + ... + 1910300.

It is an arithmetic number, because the mean of its divisors is an integer number (17192556).

Almost surely, 2^64949639 is an apocalyptic number.

64949639 is a deficient number, since it is larger than the sum of its proper divisors (3820585).

64949639 is a wasteful number, since it uses less digits than its factorization.

64949639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820584.

The product of its digits is 1259712, while the sum is 50.

The square root of 64949639 is about 8059.1338864670. The cubic root of 64949639 is about 401.9687091475.

The spelling of 64949639 in words is "sixty-four million, nine hundred forty-nine thousand, six hundred thirty-nine".