63969040 has 20 divisors (see below), whose sum is σ = 148728204. Its totient is φ = 25587584.

The previous prime is 63969023. The next prime is 63969047. The reversal of 63969040 is 4096936.

It can be written as a sum of positive squares in 2 ways, for example, as 13046544 + 50922496 = 3612^2 + 7136^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (63969047) 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, 399727 + ... + 399886.

Almost surely, 2^63969040 is an apocalyptic number.

It is an amenable number.

63969040 is an abundant number, since it is smaller than the sum of its proper divisors (84759164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63969040 is a wasteful number, since it uses less digits than its factorization.

63969040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799626 (or 799620 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 63969040 is about 7998.0647659293. The cubic root of 63969040 is about 399.9354895966.

The spelling of 63969040 in words is "sixty-three million, nine hundred sixty-nine thousand, forty".