64509478 has 16 divisors (see below), whose sum is σ = 106114896. Its totient is φ = 29168640.

The previous prime is 64509461. The next prime is 64509491. The reversal of 64509478 is 87490546.

64509478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×64509478² = 8322945503664968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351 + ... + 11842.

It is an arithmetic number, because the mean of its divisors is an integer number (6632181).

Almost surely, 2^64509478 is an apocalyptic number.

64509478 is a deficient number, since it is larger than the sum of its proper divisors (41605418).

64509478 is a wasteful number, since it uses less digits than its factorization.

64509478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15399.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 64509478 is about 8031.7792549347. The cubic root of 64509478 is about 401.0586083991.

The spelling of 64509478 in words is "sixty-four million, five hundred nine thousand, four hundred seventy-eight".