63961690 has 16 divisors (see below), whose sum is σ = 123987528. Its totient is φ = 23616576.

The previous prime is 63961687. The next prime is 63961697. The reversal of 63961690 is 9616936.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42367081 + 21594609 = 6509^2 + 4647^2 .

It is a super-2 number, since 2×63961690² = 8182195575312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63961697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245877 + ... + 246136.

Almost surely, 2^63961690 is an apocalyptic number.

63961690 is a deficient number, since it is larger than the sum of its proper divisors (60025838).

63961690 is a wasteful number, since it uses less digits than its factorization.

63961690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492033.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 63961690 is about 7997.6052665782. The cubic root of 63961690 is about 399.9201715696.

The spelling of 63961690 in words is "sixty-three million, nine hundred sixty-one thousand, six hundred ninety".