63670421 has 4 divisors (see below), whose sum is σ = 63859692. Its totient is φ = 63481152.

The previous prime is 63670403. The next prime is 63670427. The reversal of 63670421 is 12407636.

63670421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43375396 + 20295025 = 6586^2 + 4505^2 .

It is a cyclic number.

It is not a de Polignac number, because 63670421 - 2⁶ = 63670357 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 (63670427) 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 3 ways as a sum of consecutive naturals, for example, 94130 + ... + 94803.

It is an arithmetic number, because the mean of its divisors is an integer number (15964923).

Almost surely, 2^63670421 is an apocalyptic number.

It is an amenable number.

63670421 is a deficient number, since it is larger than the sum of its proper divisors (189271).

63670421 is a wasteful number, since it uses less digits than its factorization.

63670421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189270.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 63670421 is about 7979.3747248766. The cubic root of 63670421 is about 399.3121950722.

The spelling of 63670421 in words is "sixty-three million, six hundred seventy thousand, four hundred twenty-one".