64775393280 has 416 divisors, whose sum is σ = 248026101120. Its totient is φ = 15942942720.

The previous prime is 64775393261. The next prime is 64775393299. The reversal of 64775393280 is 8239357746.

64775393280 is a `hidden beast` number, since 6 + 4 + 77 + 539 + 32 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64775393261) and next prime (64775393299).

It is a tau number, because it is divible by the number of its divisors (416).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7183975 + ... + 7192985.

Almost surely, 2^64775393280 is an apocalyptic number.

64775393280 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 64775393280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124013050560).

64775393280 is an abundant number, since it is smaller than the sum of its proper divisors (183250707840).

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

64775393280 is a wasteful number, since it uses less digits than its factorization.

64775393280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9062 (or 9034 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 64775393280 in words is "sixty-four billion, seven hundred seventy-five million, three hundred ninety-three thousand, two hundred eighty".