63960781 has 4 divisors (see below), whose sum is σ = 66024064. Its totient is φ = 61897500.

The previous prime is 63960763. The next prime is 63960791. The reversal of 63960781 is 18706936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63960781 - 2⁷ = 63960653 is a prime.

It is a super-2 number, since 2×63960781² = 8181963012259922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63960751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031595 + ... + 1031656.

It is an arithmetic number, because the mean of its divisors is an integer number (16506016).

Almost surely, 2^63960781 is an apocalyptic number.

It is an amenable number.

63960781 is a deficient number, since it is larger than the sum of its proper divisors (2063283).

63960781 is a wasteful number, since it uses less digits than its factorization.

63960781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063282.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 63960781 is about 7997.5484368649. The cubic root of 63960781 is about 399.9182770545.

The spelling of 63960781 in words is "sixty-three million, nine hundred sixty thousand, seven hundred eighty-one".