63491640 has 32 divisors (see below), whose sum is σ = 190475280. Its totient is φ = 16931072.

The previous prime is 63491629. The next prime is 63491671. The reversal of 63491640 is 4619436.

63491640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×63491640⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264429 + ... + 264668.

Almost surely, 2^63491640 is an apocalyptic number.

63491640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63491640 is an abundant number, since it is smaller than the sum of its proper divisors (126983640).

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

63491640 is a wasteful number, since it uses less digits than its factorization.

63491640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529111 (or 529107 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 63491640 is about 7968.1641549356. The cubic root of 63491640 is about 398.9381000827.

The spelling of 63491640 in words is "sixty-three million, four hundred ninety-one thousand, six hundred forty".