8521780045428 has 96 divisors (see below), whose sum is σ = 23802972883200. Its totient is φ = 2620987569792.

The previous prime is 8521780045411. The next prime is 8521780045517. The reversal of 8521780045428 is 8245400871258.

8521780045428 is a `hidden beast` number, since 8 + 5 + 2 + 17 + 80 + 0 + 4 + 542 + 8 = 666.

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

It is a congruent number.

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, 2083825 + ... + 4624487.

It is an arithmetic number, because the mean of its divisors is an integer number (247947634200).

Almost surely, 2^{8521780045428} 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 8521780045428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11901486441600).

8521780045428 is an abundant number, since it is smaller than the sum of its proper divisors (15281192837772).

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

8521780045428 is a wasteful number, since it uses less digits than its factorization.

8521780045428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543078 (or 2543070 counting only the distinct ones).

The product of its (nonzero) digits is 5734400, while the sum is 54.

The spelling of 8521780045428 in words is "eight trillion, five hundred twenty-one billion, seven hundred eighty million, forty-five thousand, four hundred twenty-eight".