57521987 has 4 divisors (see below), whose sum is σ = 60549480. Its totient is φ = 54494496.

The previous prime is 57521977. The next prime is 57522007. The reversal of 57521987 is 78912575.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57521987 - 2⁶ = 57521923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57521927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513718 + ... + 1513755.

It is an arithmetic number, because the mean of its divisors is an integer number (15137370).

Almost surely, 2^57521987 is an apocalyptic number.

57521987 is a deficient number, since it is larger than the sum of its proper divisors (3027493).

57521987 is a wasteful number, since it uses less digits than its factorization.

57521987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027492.

The product of its digits is 176400, while the sum is 44.

The square root of 57521987 is about 7584.3250853322. The cubic root of 57521987 is about 386.0213215423.

The spelling of 57521987 in words is "fifty-seven million, five hundred twenty-one thousand, nine hundred eighty-seven".