63445640 has 32 divisors (see below), whose sum is σ = 146076480. Its totient is φ = 24787392.

The previous prime is 63445621. The next prime is 63445651. The reversal of 63445640 is 4654436.

It is a junction number, because it is equal to n+sod(n) for n = 63445597 and 63445606.

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, 16724 + ... + 20163.

It is an arithmetic number, because the mean of its divisors is an integer number (4564890).

Almost surely, 2^63445640 is an apocalyptic number.

It is an amenable number.

63445640 is an abundant number, since it is smaller than the sum of its proper divisors (82630840).

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

63445640 is a wasteful number, since it uses less digits than its factorization.

63445640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36941 (or 36937 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 63445640 is about 7965.2771452097. The cubic root of 63445640 is about 398.8417326123.

The spelling of 63445640 in words is "sixty-three million, four hundred forty-five thousand, six hundred forty".