64506447 has 12 divisors (see below), whose sum is σ = 93646800. Its totient is φ = 42787008.

The previous prime is 64506439. The next prime is 64506457. The reversal of 64506447 is 74460546.

64506447 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 644 + 7 = 666.

It is not a de Polignac number, because 64506447 - 2³ = 64506439 is a prime.

It is a super-2 number, since 2×64506447² = 8322163409127618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64506427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16218 + ... + 19799.

It is an arithmetic number, because the mean of its divisors is an integer number (7803900).

Almost surely, 2^64506447 is an apocalyptic number.

64506447 is a deficient number, since it is larger than the sum of its proper divisors (29140353).

64506447 is a wasteful number, since it uses less digits than its factorization.

64506447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36222 (or 36219 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 64506447 is about 8031.5905647636. The cubic root of 64506447 is about 401.0523270085.

The spelling of 64506447 in words is "sixty-four million, five hundred six thousand, four hundred forty-seven".