63578729 has 2 divisors, whose sum is σ = 63578730. Its totient is φ = 63578728.

The previous prime is 63578699. The next prime is 63578771. The reversal of 63578729 is 92787536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63568729 + 10000 = 7973^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 63578729 - 2¹² = 63574633 is a prime.

It is not a weakly prime, because it can be changed into another prime (63578789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31789364 + 31789365.

It is an arithmetic number, because the mean of its divisors is an integer number (31789365).

Almost surely, 2^63578729 is an apocalyptic number.

It is an amenable number.

63578729 is a deficient number, since it is larger than the sum of its proper divisors (1).

63578729 is an equidigital number, since it uses as much as digits as its factorization.

63578729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The square root of 63578729 is about 7973.6270918573. The cubic root of 63578729 is about 399.1204193457.

The spelling of 63578729 in words is "sixty-three million, five hundred seventy-eight thousand, seven hundred twenty-nine".