15728420401 has 4 divisors (see below), whose sum is σ = 15729221232. Its totient is φ = 15727619572.

The previous prime is 15728420387. The next prime is 15728420429. The reversal of 15728420401 is 10402482751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15728420401 - 2¹³ = 15728412209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15728420501) 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, 370195 + ... + 410488.

It is an arithmetic number, because the mean of its divisors is an integer number (3932305308).

Almost surely, 2^15728420401 is an apocalyptic number.

It is an amenable number.

15728420401 is a deficient number, since it is larger than the sum of its proper divisors (800831).

15728420401 is an equidigital number, since it uses as much as digits as its factorization.

15728420401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800830.

The product of its (nonzero) digits is 17920, while the sum is 34.

The spelling of 15728420401 in words is "fifteen billion, seven hundred twenty-eight million, four hundred twenty thousand, four hundred one".