1639728101 has 16 divisors (see below), whose sum is σ = 1884349440. Its totient is φ = 1411150320.

The previous prime is 1639728067. The next prime is 1639728107. The reversal of 1639728101 is 1018279361.

It is a cyclic number.

It is not a de Polignac number, because 1639728101 - 2⁶ = 1639728037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639728107) 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, 429266 + ... + 433068.

It is an arithmetic number, because the mean of its divisors is an integer number (117771840).

Almost surely, 2^1639728101 is an apocalyptic number.

1639728101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1639728101 is a deficient number, since it is larger than the sum of its proper divisors (244621339).

1639728101 is a wasteful number, since it uses less digits than its factorization.

1639728101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1639728101 is about 40493.5562898593. The cubic root of 1639728101 is about 1179.2085329811.

The spelling of 1639728101 in words is "one billion, six hundred thirty-nine million, seven hundred twenty-eight thousand, one hundred one".