63840723 has 4 divisors (see below), whose sum is σ = 85120968. Its totient is φ = 42560480.

The previous prime is 63840701. The next prime is 63840757. The reversal of 63840723 is 32704836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63840723 - 2²⁴ = 47063507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63840823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10640118 + ... + 10640123.

It is an arithmetic number, because the mean of its divisors is an integer number (21280242).

Almost surely, 2^63840723 is an apocalyptic number.

63840723 is a deficient number, since it is larger than the sum of its proper divisors (21280245).

63840723 is a wasteful number, since it uses less digits than its factorization.

63840723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21280244.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 63840723 is about 7990.0389861377. The cubic root of 63840723 is about 399.6678972624.

The spelling of 63840723 in words is "sixty-three million, eight hundred forty thousand, seven hundred twenty-three".