63438685 has 8 divisors (see below), whose sum is σ = 77983416. Its totient is φ = 49512960.

The previous prime is 63438667. The next prime is 63438703. The reversal of 63438685 is 58683436.

It is an interprime number because it is at equal distance from previous prime (63438667) and next prime (63438703).

It can be written as a sum of positive squares in 4 ways, for example, as 1044484 + 62394201 = 1022^2 + 7899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63438685 - 2⁵ = 63438653 is a prime.

It is a Duffinian number.

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, 154524 + ... + 154933.

It is an arithmetic number, because the mean of its divisors is an integer number (9747927).

Almost surely, 2^63438685 is an apocalyptic number.

It is an amenable number.

63438685 is a deficient number, since it is larger than the sum of its proper divisors (14544731).

63438685 is a wasteful number, since it uses less digits than its factorization.

63438685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309503.

The product of its digits is 414720, while the sum is 43.

The square root of 63438685 is about 7964.8405508208. The cubic root of 63438685 is about 398.8271582164.

The spelling of 63438685 in words is "sixty-three million, four hundred thirty-eight thousand, six hundred eighty-five".