63391040 has 28 divisors (see below), whose sum is σ = 150950676. Its totient is φ = 25356288.

The previous prime is 63391039. The next prime is 63391057. The reversal of 63391040 is 4019336.

It can be written as a sum of positive squares in 2 ways, for example, as 47004736 + 16386304 = 6856^2 + 4048^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98729 + ... + 99368.

Almost surely, 2^63391040 is an apocalyptic number.

It is an amenable number.

63391040 is an abundant number, since it is smaller than the sum of its proper divisors (87559636).

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

63391040 is a wasteful number, since it uses less digits than its factorization.

63391040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198114 (or 198104 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 63391040 is about 7961.8490314750. The cubic root of 63391040 is about 398.7272881395.

The spelling of 63391040 in words is "sixty-three million, three hundred ninety-one thousand, forty".