63557640 has 48 divisors (see below), whose sum is σ = 206563500. Its totient is φ = 16948608.

The previous prime is 63557639. The next prime is 63557651. The reversal of 63557640 is 4675536.

63557640 is a `hidden beast` number, since 6 + 3 + 5 + 5 + 7 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62821476 + 736164 = 7926^2 + 858^2 .

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 = 63557595 and 63557604.

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, 87915 + ... + 88634.

Almost surely, 2^63557640 is an apocalyptic number.

63557640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

63557640 is an abundant number, since it is smaller than the sum of its proper divisors (143005860).

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

63557640 is a wasteful number, since it uses less digits than its factorization.

63557640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176566 (or 176559 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 63557640 is about 7972.3045601633. The cubic root of 63557640 is about 399.0762851860.

The spelling of 63557640 in words is "sixty-three million, five hundred fifty-seven thousand, six hundred forty".