64642229 has 4 divisors (see below), whose sum is σ = 65737920. Its totient is φ = 63546540.

The previous prime is 64642181. The next prime is 64642241. The reversal of 64642229 is 92224646.

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 de Polignac number, because none of the positive numbers 2^k-64642229 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 (64642729) 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, 547757 + ... + 547874.

It is an arithmetic number, because the mean of its divisors is an integer number (16434480).

Almost surely, 2^64642229 is an apocalyptic number.

It is an amenable number.

64642229 is a deficient number, since it is larger than the sum of its proper divisors (1095691).

64642229 is a wasteful number, since it uses less digits than its factorization.

64642229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095690.

The product of its digits is 41472, while the sum is 35.

The square root of 64642229 is about 8040.0391168203. The cubic root of 64642229 is about 401.3335264112. Note that the first 3 decimals are identical.

It can be divided in two parts, 646 and 42229, that added together give a cube (42875 = 35³).

The spelling of 64642229 in words is "sixty-four million, six hundred forty-two thousand, two hundred twenty-nine".