15728623 has 4 divisors (see below), whose sum is σ = 15736840. Its totient is φ = 15720408.

The previous prime is 15728611. The next prime is 15728681. The reversal of 15728623 is 32682751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15728623 is a prime.

It is a super-2 number, since 2×15728623² = 494779162952258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15728693) 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, 448 + ... + 5626.

It is an arithmetic number, because the mean of its divisors is an integer number (3934210).

Almost surely, 2^15728623 is an apocalyptic number.

15728623 is a deficient number, since it is larger than the sum of its proper divisors (8217).

15728623 is an equidigital number, since it uses as much as digits as its factorization.

15728623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8216.

The product of its digits is 20160, while the sum is 34.

The square root of 15728623 is about 3965.9328032633. The cubic root of 15728623 is about 250.5514387668.

The spelling of 15728623 in words is "fifteen million, seven hundred twenty-eight thousand, six hundred twenty-three".