56740021 has 8 divisors (see below), whose sum is σ = 61460280. Its totient is φ = 52070592.

The previous prime is 56740009. The next prime is 56740027. The reversal of 56740021 is 12004765.

56740021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1535121 + 55204900 = 1239^2 + 7430^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56740021 - 2⁵ = 56739989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56740027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10366 + ... + 14863.

It is an arithmetic number, because the mean of its divisors is an integer number (7682535).

Almost surely, 2^56740021 is an apocalyptic number.

It is an amenable number.

56740021 is a deficient number, since it is larger than the sum of its proper divisors (4720259).

56740021 is a wasteful number, since it uses less digits than its factorization.

56740021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25415.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 56740021 is about 7532.5972280482. The cubic root of 56740021 is about 384.2641163488.

Adding to 56740021 its reverse (12004765), we get a palindrome (68744786).

The spelling of 56740021 in words is "fifty-six million, seven hundred forty thousand, twenty-one".