57810421 has 4 divisors (see below), whose sum is σ = 61211052. Its totient is φ = 54409792.

The previous prime is 57810419. The next prime is 57810437. The reversal of 57810421 is 12401875.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49196196 + 8614225 = 7014^2 + 2935^2 .

It is not a de Polignac number, because 57810421 - 2¹ = 57810419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57810421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57811421) 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, 1700290 + ... + 1700323.

It is an arithmetic number, because the mean of its divisors is an integer number (15302763).

Almost surely, 2^57810421 is an apocalyptic number.

It is an amenable number.

57810421 is a deficient number, since it is larger than the sum of its proper divisors (3400631).

57810421 is a wasteful number, since it uses less digits than its factorization.

57810421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400630.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 57810421 is about 7603.3164474458. The cubic root of 57810421 is about 386.6654583626.

The spelling of 57810421 in words is "fifty-seven million, eight hundred ten thousand, four hundred twenty-one".