63457640 has 32 divisors (see below), whose sum is σ = 143522280. Its totient is φ = 25251072.

The previous prime is 63457633. The next prime is 63457657. The reversal of 63457640 is 4675436.

It can be written as a sum of positive squares in 4 ways, for example, as 63457156 + 484 = 7966^2 + 22^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 63457640.

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 7 ways as a sum of consecutive naturals, for example, 3854 + ... + 11906.

Almost surely, 2^63457640 is an apocalyptic number.

It is an amenable number.

63457640 is an abundant number, since it is smaller than the sum of its proper divisors (80064640).

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

63457640 is a wasteful number, since it uses less digits than its factorization.

63457640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8261 (or 8257 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 63457640 is about 7966.0303790533. The cubic root of 63457640 is about 398.8668764419.

The spelling of 63457640 in words is "sixty-three million, four hundred fifty-seven thousand, six hundred forty".