57421920 has 192 divisors, whose sum is σ = 198567936. Its totient is φ = 13885440.

The previous prime is 57421913. The next prime is 57421981. The reversal of 57421920 is 2912475.

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

It is a congruent number.

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, 252847 + ... + 253073.

It is an arithmetic number, because the mean of its divisors is an integer number (1034208).

Almost surely, 2^57421920 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 57421920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99283968).

57421920 is an abundant number, since it is smaller than the sum of its proper divisors (141146016).

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

57421920 is a wasteful number, since it uses less digits than its factorization.

57421920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 57421920 is about 7577.7252523432. The cubic root of 57421920 is about 385.7973467995.

The spelling of 57421920 in words is "fifty-seven million, four hundred twenty-one thousand, nine hundred twenty".