65664210 has 16 divisors (see below), whose sum is σ = 157594176. Its totient is φ = 17510448.

The previous prime is 65664199. The next prime is 65664211. The reversal of 65664210 is 1246656.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2188807 = 65664210 / (6 + 5 + 6 + 6 + 4 + 2 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (65664211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094374 + ... + 1094433.

It is an arithmetic number, because the mean of its divisors is an integer number (9849636).

Almost surely, 2^65664210 is an apocalyptic number.

65664210 is an abundant number, since it is smaller than the sum of its proper divisors (91929966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65664210 is a wasteful number, since it uses less digits than its factorization.

65664210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188817.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 65664210 is about 8103.3456053657. The cubic root of 65664210 is about 403.4374788927.

The spelling of 65664210 in words is "sixty-five million, six hundred sixty-four thousand, two hundred ten".