63678121 has 4 divisors (see below), whose sum is σ = 68576452. Its totient is φ = 58779792.

The previous prime is 63678103. The next prime is 63678137. The reversal of 63678121 is 12187636.

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 36000000 + 27678121 = 6000^2 + 5261^2 .

It is a cyclic number.

It is not a de Polignac number, because 63678121 - 2⁷ = 63677993 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63678151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2449146 + ... + 2449171.

It is an arithmetic number, because the mean of its divisors is an integer number (17144113).

Almost surely, 2^63678121 is an apocalyptic number.

It is an amenable number.

63678121 is a deficient number, since it is larger than the sum of its proper divisors (4898331).

63678121 is a wasteful number, since it uses less digits than its factorization.

63678121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4898330.

The product of its digits is 12096, while the sum is 34.

The square root of 63678121 is about 7979.8572042362. The cubic root of 63678121 is about 399.3282914003.

The spelling of 63678121 in words is "sixty-three million, six hundred seventy-eight thousand, one hundred twenty-one".