63257840 has 40 divisors (see below), whose sum is σ = 154818960. Its totient is φ = 23970816.

The previous prime is 63257839. The next prime is 63257851. The reversal of 63257840 is 4875236.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 63257840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19289 + ... + 22328.

It is an arithmetic number, because the mean of its divisors is an integer number (3870474).

Almost surely, 2^63257840 is an apocalyptic number.

It is an amenable number.

63257840 is an abundant number, since it is smaller than the sum of its proper divisors (91561120).

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

63257840 is a wasteful number, since it uses less digits than its factorization.

63257840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41649 (or 41643 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 63257840 is about 7953.4797415974. The cubic root of 63257840 is about 398.4478179514.

The spelling of 63257840 in words is "sixty-three million, two hundred fifty-seven thousand, eight hundred forty".