64940220 has 36 divisors (see below), whose sum is σ = 196985880. Its totient is φ = 17317344.

The previous prime is 64940209. The next prime is 64940243. The reversal of 64940220 is 2204946.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180210 + ... + 180569.

It is an arithmetic number, because the mean of its divisors is an integer number (5471830).

Almost surely, 2^64940220 is an apocalyptic number.

64940220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64940220 is an abundant number, since it is smaller than the sum of its proper divisors (132045660).

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

64940220 is a wasteful number, since it uses less digits than its factorization.

64940220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360794 (or 360789 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 64940220 is about 8058.5494972731. The cubic root of 64940220 is about 401.9492770338.

The spelling of 64940220 in words is "sixty-four million, nine hundred forty thousand, two hundred twenty".