15645321428 has 24 divisors (see below), whose sum is σ = 30831838464. Its totient is φ = 6882105600.

The previous prime is 15645321407. The next prime is 15645321451. The reversal of 15645321428 is 82412354651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5733725 + ... + 5736452.

It is an arithmetic number, because the mean of its divisors is an integer number (1284659936).

Almost surely, 2^15645321428 is an apocalyptic number.

It is an amenable number.

15645321428 is a deficient number, since it is larger than the sum of its proper divisors (15186517036).

15645321428 is a wasteful number, since it uses less digits than its factorization.

15645321428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11470223 (or 11470221 counting only the distinct ones).

The product of its digits is 230400, while the sum is 41.

The spelling of 15645321428 in words is "fifteen billion, six hundred forty-five million, three hundred twenty-one thousand, four hundred twenty-eight".