56421639 has 12 divisors (see below), whose sum is σ = 82414800. Its totient is φ = 37191264.

The previous prime is 56421637. The next prime is 56421647. The reversal of 56421639 is 93612465.

It is a happy number.

56421639 is a `hidden beast` number, since 5 + 642 + 1 + 6 + 3 + 9 = 666.

It is not a de Polignac number, because 56421639 - 2¹ = 56421637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56421637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34419 + ... + 36020.

It is an arithmetic number, because the mean of its divisors is an integer number (6867900).

Almost surely, 2^56421639 is an apocalyptic number.

56421639 is a deficient number, since it is larger than the sum of its proper divisors (25993161).

56421639 is a wasteful number, since it uses less digits than its factorization.

56421639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70534 (or 70531 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 56421639 is about 7511.4338844191. The cubic root of 56421639 is about 383.5440348061.

The spelling of 56421639 in words is "fifty-six million, four hundred twenty-one thousand, six hundred thirty-nine".