57421740 has 96 divisors (see below), whose sum is σ = 169364160. Its totient is φ = 14515200.

The previous prime is 57421729. The next prime is 57421753. The reversal of 57421740 is 4712475.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 57421698 and 57421707.

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, 105870 + ... + 106410.

It is an arithmetic number, because the mean of its divisors is an integer number (1764210).

Almost surely, 2^57421740 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 57421740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84682080).

57421740 is an abundant number, since it is smaller than the sum of its proper divisors (111942420).

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

57421740 is a wasteful number, since it uses less digits than its factorization.

57421740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 57421740 is about 7577.7133754187. The cubic root of 57421740 is about 385.7969436805.

The spelling of 57421740 in words is "fifty-seven million, four hundred twenty-one thousand, seven hundred forty".