63450640 has 40 divisors (see below), whose sum is σ = 160936128. Its totient is φ = 23072640.

The previous prime is 63450619. The next prime is 63450649. The reversal of 63450640 is 4605436.

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

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 63450599 and 63450608.

It is not an unprimeable number, because it can be changed into a prime (63450649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35172 + ... + 36931.

Almost surely, 2^63450640 is an apocalyptic number.

It is an amenable number.

63450640 is an abundant number, since it is smaller than the sum of its proper divisors (97485488).

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

63450640 is a wasteful number, since it uses less digits than its factorization.

63450640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72127 (or 72121 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 63450640 is about 7965.5910013005. The cubic root of 63450640 is about 398.8522095932.

The spelling of 63450640 in words is "sixty-three million, four hundred fifty thousand, six hundred forty".