63453640 has 32 divisors (see below), whose sum is σ = 143007480. Its totient is φ = 25339392.

The previous prime is 63453569. The next prime is 63453647. The reversal of 63453640 is 4635436.

63453640 = 390² + 391² + ... + 629².

It can be written as a sum of positive squares in 4 ways, for example, as 30758116 + 32695524 = 5546^2 + 5718^2 .

It is not an unprimeable number, because it can be changed into a prime (63453647) 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, 36634 + ... + 38326.

Almost surely, 2^63453640 is an apocalyptic number.

It is an amenable number.

63453640 is an abundant number, since it is smaller than the sum of its proper divisors (79553840).

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

63453640 is a wasteful number, since it uses less digits than its factorization.

63453640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641 (or 2637 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 63453640 is about 7965.7793090193. The cubic root of 63453640 is about 398.8584955176.

The spelling of 63453640 in words is "sixty-three million, four hundred fifty-three thousand, six hundred forty".