28278455478 has 64 divisors (see below), whose sum is σ = 73272138240. Its totient is φ = 7065522432.

The previous prime is 28278455461. The next prime is 28278455501. The reversal of 28278455478 is 87455487282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1352575 + ... + 1373322.

It is an arithmetic number, because the mean of its divisors is an integer number (1144877160).

Almost surely, 2^28278455478 is an apocalyptic number.

28278455478 is an abundant number, since it is smaller than the sum of its proper divisors (44993682762).

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

28278455478 is a wasteful number, since it uses less digits than its factorization.

28278455478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725941.

The product of its digits is 40140800, while the sum is 60.

The spelling of 28278455478 in words is "twenty-eight billion, two hundred seventy-eight million, four hundred fifty-five thousand, four hundred seventy-eight".