63646420 has 12 divisors (see below), whose sum is σ = 133657524. Its totient is φ = 25458560.

The previous prime is 63646403. The next prime is 63646421. The reversal of 63646420 is 2464636.

It can be written as a sum of positive squares in 2 ways, for example, as 25280784 + 38365636 = 5028^2 + 6194^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63646421) 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, 1591141 + ... + 1591180.

It is an arithmetic number, because the mean of its divisors is an integer number (11138127).

Almost surely, 2^63646420 is an apocalyptic number.

It is an amenable number.

63646420 is an abundant number, since it is smaller than the sum of its proper divisors (70011104).

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

63646420 is a wasteful number, since it uses less digits than its factorization.

63646420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182330 (or 3182328 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

The square root of 63646420 is about 7977.8706432230. The cubic root of 63646420 is about 399.2620142800.

The spelling of 63646420 in words is "sixty-three million, six hundred forty-six thousand, four hundred twenty".