28162693644 has 12 divisors (see below), whose sum is σ = 65712951864. Its totient is φ = 9387564544.

The previous prime is 28162693631. The next prime is 28162693649. The reversal of 28162693644 is 44639626182.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28162693649) 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, 1173445557 + ... + 1173445580.

It is an arithmetic number, because the mean of its divisors is an integer number (5476079322).

Almost surely, 2^28162693644 is an apocalyptic number.

It is an amenable number.

28162693644 is an abundant number, since it is smaller than the sum of its proper divisors (37550258220).

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

28162693644 is a wasteful number, since it uses less digits than its factorization.

28162693644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346891144 (or 2346891142 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 51.

The spelling of 28162693644 in words is "twenty-eight billion, one hundred sixty-two million, six hundred ninety-three thousand, six hundred forty-four".