64819645 has 16 divisors (see below), whose sum is σ = 85095360. Its totient is φ = 47008000.

The previous prime is 64819631. The next prime is 64819649. The reversal of 64819645 is 54691846.

It is not a de Polignac number, because 64819645 - 2⁵ = 64819613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64819649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20586 + ... + 23524.

It is an arithmetic number, because the mean of its divisors is an integer number (5318460).

Almost surely, 2^64819645 is an apocalyptic number.

It is an amenable number.

64819645 is a deficient number, since it is larger than the sum of its proper divisors (20275715).

64819645 is a wasteful number, since it uses less digits than its factorization.

64819645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356.

The product of its digits is 207360, while the sum is 43.

The square root of 64819645 is about 8051.0648364052. The cubic root of 64819645 is about 401.7003554862.

The spelling of 64819645 in words is "sixty-four million, eight hundred nineteen thousand, six hundred forty-five".