16728563439 has 24 divisors (see below), whose sum is σ = 27623031072. Its totient is φ = 9556539840.

The previous prime is 16728563429. The next prime is 16728563477. The reversal of 16728563439 is 93436582761.

16728563439 is a `hidden beast` number, since 1 + 6 + 72 + 8 + 563 + 4 + 3 + 9 = 666.

It is not a de Polignac number, because 16728563439 - 2⁷ = 16728563311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16728563429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205977 + ... + 275469.

It is an arithmetic number, because the mean of its divisors is an integer number (1150959628).

Almost surely, 2^16728563439 is an apocalyptic number.

16728563439 is a deficient number, since it is larger than the sum of its proper divisors (10894467633).

16728563439 is a wasteful number, since it uses less digits than its factorization.

16728563439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73327 (or 73324 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 16728563439 in words is "sixteen billion, seven hundred twenty-eight million, five hundred sixty-three thousand, four hundred thirty-nine".