1963649890 has 8 divisors (see below), whose sum is σ = 3534569820. Its totient is φ = 785459952.

The previous prime is 1963649879. The next prime is 1963649899. The reversal of 1963649890 is 989463691.

It can be written as a sum of positive squares in 2 ways, for example, as 1963641969 + 7921 = 44313^2 + 89^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1963649899) 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, 98182485 + ... + 98182504.

Almost surely, 2^1963649890 is an apocalyptic number.

1963649890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1963649890 is a deficient number, since it is larger than the sum of its proper divisors (1570919930).

1963649890 is a wasteful number, since it uses less digits than its factorization.

1963649890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196364996.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 1963649890 is about 44313.0893754881. The cubic root of 1963649890 is about 1252.2412887645.

The spelling of 1963649890 in words is "one billion, nine hundred sixty-three million, six hundred forty-nine thousand, eight hundred ninety".