64870221528 has 288 divisors, whose sum is σ = 218518054560. Its totient is φ = 17273088000.

The previous prime is 64870221509. The next prime is 64870221569. The reversal of 64870221528 is 82512207846.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6172278 + ... + 6182778.

It is an arithmetic number, because the mean of its divisors is an integer number (758743245).

Almost surely, 2^64870221528 is an apocalyptic number.

64870221528 is a gapful number since it is divisible by the number (68) 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 64870221528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109259027280).

64870221528 is an abundant number, since it is smaller than the sum of its proper divisors (153647833032).

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

64870221528 is a wasteful number, since it uses less digits than its factorization.

64870221528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10647 (or 10633 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 64870221528 in words is "sixty-four billion, eight hundred seventy million, two hundred twenty-one thousand, five hundred twenty-eight".