64876820 has 12 divisors (see below), whose sum is σ = 136241364. Its totient is φ = 25950720.

The previous prime is 64876793. The next prime is 64876829. The reversal of 64876820 is 2867846.

It can be written as a sum of positive squares in 2 ways, for example, as 47803396 + 17073424 = 6914^2 + 4132^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64876829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621901 + ... + 1621940.

It is an arithmetic number, because the mean of its divisors is an integer number (11353447).

Almost surely, 2^64876820 is an apocalyptic number.

It is an amenable number.

64876820 is an abundant number, since it is smaller than the sum of its proper divisors (71364544).

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

64876820 is a wasteful number, since it uses less digits than its factorization.

64876820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243850 (or 3243848 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 64876820 is about 8054.6148262968. The cubic root of 64876820 is about 401.8184290954.

The spelling of 64876820 in words is "sixty-four million, eight hundred seventy-six thousand, eight hundred twenty".