64843645 has 16 divisors (see below), whose sum is σ = 79781760. Its totient is φ = 50574784.

The previous prime is 64843643. The next prime is 64843651. The reversal of 64843645 is 54634846.

64843645 = 43² + 44² + ... + 579².

It is a cyclic number.

It is not a de Polignac number, because 64843645 - 2¹ = 64843643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64843598 and 64843607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64843643) 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, 46752 + ... + 48118.

It is an arithmetic number, because the mean of its divisors is an integer number (4986360).

Almost surely, 2^64843645 is an apocalyptic number.

It is an amenable number.

64843645 is a deficient number, since it is larger than the sum of its proper divisors (14938115).

64843645 is a wasteful number, since it uses less digits than its factorization.

64843645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604.

The product of its digits is 276480, while the sum is 40.

The square root of 64843645 is about 8052.5551845361. Note that the first 3 decimals coincide. The cubic root of 64843645 is about 401.7499269750.

The spelling of 64843645 in words is "sixty-four million, eight hundred forty-three thousand, six hundred forty-five".