63487440 has 60 divisors (see below), whose sum is σ = 213214404. Its totient is φ = 16929792.

The previous prime is 63487439. The next prime is 63487451. The reversal of 63487440 is 4478436.

It can be written as a sum of positive squares in 2 ways, for example, as 31270464 + 32216976 = 5592^2 + 5676^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 63487395 and 63487404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43369 + ... + 44808.

Almost surely, 2^63487440 is an apocalyptic number.

63487440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63487440 is an abundant number, since it is smaller than the sum of its proper divisors (149726964).

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

63487440 is a wasteful number, since it uses less digits than its factorization.

63487440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88196 (or 88187 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 63487440 is about 7967.9006017897. The cubic root of 63487440 is about 398.9293032450.

The spelling of 63487440 in words is "sixty-three million, four hundred eighty-seven thousand, four hundred forty".