64706220 has 36 divisors (see below), whose sum is σ = 196276080. Its totient is φ = 17254944.

The previous prime is 64706189. The next prime is 64706231. The reversal of 64706220 is 2260746.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179560 + ... + 179919.

Almost surely, 2^64706220 is an apocalyptic number.

64706220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64706220 is an abundant number, since it is smaller than the sum of its proper divisors (131569860).

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

64706220 is a wasteful number, since it uses less digits than its factorization.

64706220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359494 (or 359489 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 64706220 is about 8044.0176528896. The cubic root of 64706220 is about 401.4659128527.

Adding to 64706220 its reverse (2260746), we get a palindrome (66966966).

The spelling of 64706220 in words is "sixty-four million, seven hundred six thousand, two hundred twenty".