15728420399 has 4 divisors (see below), whose sum is σ = 15731588136. Its totient is φ = 15725252664.

The previous prime is 15728420387. The next prime is 15728420429. The reversal of 15728420399 is 99302482751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99302482751 = 127 ⋅781909313.

It is a cyclic number.

It is not a de Polignac number, because 15728420399 - 2³² = 11433453103 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 (15728420339) 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, 1576409 + ... + 1586354.

It is an arithmetic number, because the mean of its divisors is an integer number (3932897034).

Almost surely, 2^15728420399 is an apocalyptic number.

15728420399 is a deficient number, since it is larger than the sum of its proper divisors (3167737).

15728420399 is an equidigital number, since it uses as much as digits as its factorization.

15728420399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167736.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 15728420399 in words is "fifteen billion, seven hundred twenty-eight million, four hundred twenty thousand, three hundred ninety-nine".