63681890 has 8 divisors (see below), whose sum is σ = 114627420. Its totient is φ = 25472752.

The previous prime is 63681889. The next prime is 63681953. The reversal of 63681890 is 9818636.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62837329 + 844561 = 7927^2 + 919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×63681890² = 8110766227944200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3184085 + ... + 3184104.

Almost surely, 2^63681890 is an apocalyptic number.

63681890 is a deficient number, since it is larger than the sum of its proper divisors (50945530).

63681890 is a wasteful number, since it uses less digits than its factorization.

63681890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6368196.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 63681890 is about 7980.0933578499. The cubic root of 63681890 is about 399.3361697663.

The spelling of 63681890 in words is "sixty-three million, six hundred eighty-one thousand, eight hundred ninety".