15728717146 has 4 divisors (see below), whose sum is σ = 23593075722. Its totient is φ = 7864358572.

The previous prime is 15728717071. The next prime is 15728717149. The reversal of 15728717146 is 64171782751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64171782751 = 103 ⋅623027017.

It can be written as a sum of positive squares in only one way, i.e., 15665275921 + 63441225 = 125161^2 + 7965^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15728717146.

It is not an unprimeable number, because it can be changed into a prime (15728717149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932179285 + ... + 3932179288.

Almost surely, 2^15728717146 is an apocalyptic number.

15728717146 is a deficient number, since it is larger than the sum of its proper divisors (7864358576).

15728717146 is an equidigital number, since it uses as much as digits as its factorization.

15728717146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7864358575.

The product of its digits is 658560, while the sum is 49.

The spelling of 15728717146 in words is "fifteen billion, seven hundred twenty-eight million, seven hundred seventeen thousand, one hundred forty-six".