64642849 has 4 divisors (see below), whose sum is σ = 64679236. Its totient is φ = 64606464.

The previous prime is 64642829. The next prime is 64642931. The reversal of 64642849 is 94824646.

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 26450449 + 38192400 = 5143^2 + 6180^2 .

It is a cyclic number.

It is not a de Polignac number, because 64642849 - 2¹³ = 64634657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64642829) 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, 15384 + ... + 19129.

It is an arithmetic number, because the mean of its divisors is an integer number (16169809).

Almost surely, 2^64642849 is an apocalyptic number.

It is an amenable number.

64642849 is a deficient number, since it is larger than the sum of its proper divisors (36387).

64642849 is a wasteful number, since it uses less digits than its factorization.

64642849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36386.

The product of its digits is 331776, while the sum is 43.

The square root of 64642849 is about 8040.0776737542. The cubic root of 64642849 is about 401.3348095043.

The spelling of 64642849 in words is "sixty-four million, six hundred forty-two thousand, eight hundred forty-nine".