64780780 has 48 divisors (see below), whose sum is σ = 143115840. Its totient is φ = 24595200.

The previous prime is 64780777. The next prime is 64780783. The reversal of 64780780 is 8708746.

It is an interprime number because it is at equal distance from previous prime (64780777) and next prime (64780783).

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64780783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 34465 + ... + 36295.

It is an arithmetic number, because the mean of its divisors is an integer number (2981580).

Almost surely, 2^64780780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64780780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71557920).

64780780 is an abundant number, since it is smaller than the sum of its proper divisors (78335060).

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

64780780 is a wasteful number, since it uses less digits than its factorization.

64780780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930 (or 1928 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 64780780 is about 8048.6508186155. The cubic root of 64780780 is about 401.6200546987.

The spelling of 64780780 in words is "sixty-four million, seven hundred eighty thousand, seven hundred eighty".