63660389 has 12 divisors (see below), whose sum is σ = 71675436. Its totient is φ = 56202432.

The previous prime is 63660383. The next prime is 63660433. The reversal of 63660389 is 98306636.

It can be written as a sum of positive squares in 2 ways, for example, as 6400900 + 57259489 = 2530^2 + 7567^2 .

It is not a de Polignac number, because 63660389 - 2¹² = 63656293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63660383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2249 + ... + 11505.

It is an arithmetic number, because the mean of its divisors is an integer number (5972953).

Almost surely, 2^63660389 is an apocalyptic number.

It is an amenable number.

63660389 is a deficient number, since it is larger than the sum of its proper divisors (8015047).

63660389 is a wasteful number, since it uses less digits than its factorization.

63660389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316 (or 9293 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 63660389 is about 7978.7460794288. The cubic root of 63660389 is about 399.2912219092.

The spelling of 63660389 in words is "sixty-three million, six hundred sixty thousand, three hundred eighty-nine".