64445506 has 4 divisors (see below), whose sum is σ = 96668262. Its totient is φ = 32222752.

The previous prime is 64445503. The next prime is 64445531. The reversal of 64445506 is 60554446.

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

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 1798281 = 7915^2 + 1341^2 .

It is not an unprimeable number, because it can be changed into a prime (64445503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16111375 + ... + 16111378.

Almost surely, 2^64445506 is an apocalyptic number.

64445506 is a deficient number, since it is larger than the sum of its proper divisors (32222756).

64445506 is a wasteful number, since it uses less digits than its factorization.

64445506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32222755.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 64445506 is about 8027.7958369655. The cubic root of 64445506 is about 400.9259921920.

The spelling of 64445506 in words is "sixty-four million, four hundred forty-five thousand, five hundred six".