28215344928 has 24 divisors (see below), whose sum is σ = 74065280688. Its totient is φ = 9405114944.

The previous prime is 28215344923. The next prime is 28215344987. The reversal of 28215344928 is 82944351282.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×28215344928² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (28215344923) 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, 146954826 + ... + 146955017.

It is an arithmetic number, because the mean of its divisors is an integer number (3086053362).

Almost surely, 2^28215344928 is an apocalyptic number.

It is an amenable number.

28215344928 is an abundant number, since it is smaller than the sum of its proper divisors (45849935760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28215344928 is a wasteful number, since it uses less digits than its factorization.

28215344928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293909856 (or 293909848 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The spelling of 28215344928 in words is "twenty-eight billion, two hundred fifteen million, three hundred forty-four thousand, nine hundred twenty-eight".