63789993 has 12 divisors (see below), whose sum is σ = 92359540. Its totient is φ = 42425856.

The previous prime is 63789983. The next prime is 63790007. The reversal of 63789993 is 39998736.

It can be written as a sum of positive squares in 2 ways, for example, as 12981609 + 50808384 = 3603^2 + 7128^2 .

It is not a de Polignac number, because 63789993 - 2⁴ = 63789977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63789923) 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, 4288 + ... + 12081.

Almost surely, 2^63789993 is an apocalyptic number.

It is an amenable number.

63789993 is a deficient number, since it is larger than the sum of its proper divisors (28569547).

63789993 is a wasteful number, since it uses less digits than its factorization.

63789993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808 (or 16805 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 63789993 is about 7986.8637774786. The cubic root of 63789993 is about 399.5620059948.

The spelling of 63789993 in words is "sixty-three million, seven hundred eighty-nine thousand, nine hundred ninety-three".