64771380 has 192 divisors, whose sum is σ = 217728000. Its totient is φ = 15935616.

The previous prime is 64771339. The next prime is 64771387. The reversal of 64771380 is 8317746.

64771380 is a `hidden beast` number, since 647 + 7 + 1 + 3 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64771387) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 605287 + ... + 605393.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^64771380 is an apocalyptic number.

64771380 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 64771380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108864000).

64771380 is an abundant number, since it is smaller than the sum of its proper divisors (152956620).

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

64771380 is a wasteful number, since it uses less digits than its factorization.

64771380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 64771380 is about 8048.0668486289. The cubic root of 64771380 is about 401.6006280975.

It can be divided in two parts, 647 and 71380, that added together give a palindrome (72027).

The spelling of 64771380 in words is "sixty-four million, seven hundred seventy-one thousand, three hundred eighty".