64744780 has 48 divisors (see below), whose sum is σ = 145313280. Its totient is φ = 24159168.

The previous prime is 64744769. The next prime is 64744787. The reversal of 64744780 is 8744746.

It is not an unprimeable number, because it can be changed into a prime (64744787) 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, 24189 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (3027360).

Almost surely, 2^64744780 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 64744780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72656640).

64744780 is an abundant number, since it is smaller than the sum of its proper divisors (80568500).

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

64744780 is a wasteful number, since it uses less digits than its factorization.

64744780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638 (or 2636 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 40.

The square root of 64744780 is about 8046.4141081602. The cubic root of 64744780 is about 401.5456447628.

The spelling of 64744780 in words is "sixty-four million, seven hundred forty-four thousand, seven hundred eighty".