64816780 has 48 divisors (see below), whose sum is σ = 156018240. Its totient is φ = 22157568.

The previous prime is 64816757. The next prime is 64816789. The reversal of 64816780 is 8761846.

64816780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64816789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91066 + ... + 91774.

It is an arithmetic number, because the mean of its divisors is an integer number (3250380).

Almost surely, 2^64816780 is an apocalyptic number.

It is an amenable number.

64816780 is an abundant number, since it is smaller than the sum of its proper divisors (91201460).

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

64816780 is a wasteful number, since it uses less digits than its factorization.

64816780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1376 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 64816780 is about 8050.8869076643. The cubic root of 64816780 is about 401.6944370723.

The spelling of 64816780 in words is "sixty-four million, eight hundred sixteen thousand, seven hundred eighty".