63138765 has 16 divisors (see below), whose sum is σ = 106964928. Its totient is φ = 31693056.

The previous prime is 63138763. The next prime is 63138787. The reversal of 63138765 is 56783136.

It is not a de Polignac number, because 63138765 - 2¹ = 63138763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63138763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123547 + ... + 124056.

It is an arithmetic number, because the mean of its divisors is an integer number (6685308).

Almost surely, 2^63138765 is an apocalyptic number.

It is an amenable number.

63138765 is a deficient number, since it is larger than the sum of its proper divisors (43826163).

63138765 is a wasteful number, since it uses less digits than its factorization.

63138765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247628.

The product of its digits is 90720, while the sum is 39.

The square root of 63138765 is about 7945.9904983583. The cubic root of 63138765 is about 398.1976514637.

It can be divided in two parts, 63138 and 765, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 63138765 in words is "sixty-three million, one hundred thirty-eight thousand, seven hundred sixty-five".