64620780 has 96 divisors (see below), whose sum is σ = 210760704. Its totient is φ = 14486784.

The previous prime is 64620779. The next prime is 64620781. The reversal of 64620780 is 8702646.

64620780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64620779) and next prime (64620781).

It is not an unprimeable number, because it can be changed into a prime (64620781) 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 31 ways as a sum of consecutive naturals, for example, 20809 + ... + 23711.

It is an arithmetic number, because the mean of its divisors is an integer number (2195424).

Almost surely, 2^64620780 is an apocalyptic number.

64620780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64620780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105380352).

64620780 is an abundant number, since it is smaller than the sum of its proper divisors (146139924).

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

64620780 is a wasteful number, since it uses less digits than its factorization.

64620780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975 (or 2973 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 64620780 is about 8038.7051196073. The cubic root of 64620780 is about 401.2891325466.

The spelling of 64620780 in words is "sixty-four million, six hundred twenty thousand, seven hundred eighty".