63645620 has 24 divisors (see below), whose sum is σ = 141518664. Its totient is φ = 23960576.

The previous prime is 63645599. The next prime is 63645641. The reversal of 63645620 is 2654636.

It is an interprime number because it is at equal distance from previous prime (63645599) and next prime (63645641).

It can be written as a sum of positive squares in 4 ways, for example, as 12208036 + 51437584 = 3494^2 + 7172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93257 + ... + 93936.

It is an arithmetic number, because the mean of its divisors is an integer number (5896611).

Almost surely, 2^63645620 is an apocalyptic number.

It is an amenable number.

63645620 is an abundant number, since it is smaller than the sum of its proper divisors (77873044).

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

63645620 is a wasteful number, since it uses less digits than its factorization.

63645620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187219 (or 187217 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 63645620 is about 7977.8205043734. The cubic root of 63645620 is about 399.2603414394.

The spelling of 63645620 in words is "sixty-three million, six hundred forty-five thousand, six hundred twenty".