57420781 has 32 divisors (see below), whose sum is σ = 70063488. Its totient is φ = 46448640.

The previous prime is 57420763. The next prime is 57420791. The reversal of 57420781 is 18702475.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 57420781 - 2⁷ = 57420653 is a prime.

It is a super-2 number, since 2×57420781² = 6594292181299922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57420731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297421 + ... + 297613.

It is an arithmetic number, because the mean of its divisors is an integer number (2189484).

Almost surely, 2^57420781 is an apocalyptic number.

It is an amenable number.

57420781 is a deficient number, since it is larger than the sum of its proper divisors (12642707).

57420781 is a wasteful number, since it uses less digits than its factorization.

57420781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 57420781 is about 7577.6500974906. The cubic root of 57420781 is about 385.7947959381.

The spelling of 57420781 in words is "fifty-seven million, four hundred twenty thousand, seven hundred eighty-one".