63840520 has 16 divisors (see below), whose sum is σ = 143641260. Its totient is φ = 25536192.

The previous prime is 63840499. The next prime is 63840527. The reversal of 63840520 is 2504836.

It can be written as a sum of positive squares in 2 ways, for example, as 59505796 + 4334724 = 7714^2 + 2082^2 .

It is a super-2 number, since 2×63840520² = 8151223987740800, which contains 22 as substring.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 63840 and 520 contains 63840520 itself.

It is not an unprimeable number, because it can be changed into a prime (63840527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797967 + ... + 798046.

Almost surely, 2^63840520 is an apocalyptic number.

It is an amenable number.

63840520 is an abundant number, since it is smaller than the sum of its proper divisors (79800740).

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

63840520 is a wasteful number, since it uses less digits than its factorization.

63840520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596024 (or 1596020 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 63840520 is about 7990.0262828103. The cubic root of 63840520 is about 399.6674736422.

The spelling of 63840520 in words is "sixty-three million, eight hundred forty thousand, five hundred twenty".