63490041890 has 24 divisors (see below), whose sum is σ = 125615837340. Its totient is φ = 23087287520.

The previous prime is 63490041889. The next prime is 63490041893. The reversal of 63490041890 is 9814009436.

It can be written as a sum of positive squares in 2 ways, for example, as 59435026849 + 4055015041 = 243793^2 + 63679^2 .

It is not an unprimeable number, because it can be changed into a prime (63490041893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26234345 + ... + 26236764.

Almost surely, 2^63490041890 is an apocalyptic number.

63490041890 is a deficient number, since it is larger than the sum of its proper divisors (62125795450).

63490041890 is a wasteful number, since it uses less digits than its factorization.

63490041890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52471138 (or 52471127 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 63490041890 in words is "sixty-three billion, four hundred ninety million, forty-one thousand, eight hundred ninety".