53421549840 has 640 divisors, whose sum is σ = 198707281920. Its totient is φ = 13159821312.

The previous prime is 53421549829. The next prime is 53421549851. The reversal of 53421549840 is 4894512435.

53421549840 is a `hidden beast` number, since 5 + 3 + 4 + 21 + 549 + 84 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (53421549829) and next prime (53421549851).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 319889437 + ... + 319889603.

It is an arithmetic number, because the mean of its divisors is an integer number (310480128).

Almost surely, 2^53421549840 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 53421549840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99353640960).

53421549840 is an abundant number, since it is smaller than the sum of its proper divisors (145285732080).

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

53421549840 is a wasteful number, since it uses less digits than its factorization.

53421549840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 53421549840 in words is "fifty-three billion, four hundred twenty-one million, five hundred forty-nine thousand, eight hundred forty".