57521346840 has 96 divisors (see below), whose sum is σ = 187156176480. Its totient is φ = 15321647616.

The previous prime is 57521346811. The next prime is 57521346877. The reversal of 57521346840 is 4864312575.

57521346840 is a `hidden beast` number, since 5 + 7 + 521 + 3 + 46 + 84 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229252 + ... + 409388.

It is an arithmetic number, because the mean of its divisors is an integer number (1949543505).

Almost surely, 2^57521346840 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 57521346840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93578088240).

57521346840 is an abundant number, since it is smaller than the sum of its proper divisors (129634829640).

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

57521346840 is a wasteful number, since it uses less digits than its factorization.

57521346840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181041 (or 181034 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 57521346840 in words is "fifty-seven billion, five hundred twenty-one million, three hundred forty-six thousand, eight hundred forty".