28178940691456 has 33 divisors (see below), whose sum is σ = 56330702458879. Its totient is φ = 14089385411584.

The previous prime is 28178940691423. The next prime is 28178940691463. The reversal of 28178940691456 is 65419604987182.

The square root of 28178940691456 is 5308384.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 169785345 + ... + 169951231.

Almost surely, 2^{28178940691456} is an apocalyptic number.

28178940691456 is the 5308384-th square number.

It is an amenable number.

28178940691456 is a deficient number, since it is larger than the sum of its proper divisors (28151761767423).

28178940691456 is an frugal number, since it uses more digits than its factorization.

28178940691456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331794 (or 165889 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 70.

The spelling of 28178940691456 in words is "twenty-eight trillion, one hundred seventy-eight billion, nine hundred forty million, six hundred ninety-one thousand, four hundred fifty-six".