28254864978 has 24 divisors (see below), whose sum is σ = 61251528000. Its totient is φ = 9413264664.

The previous prime is 28254864973. The next prime is 28254864997. The reversal of 28254864978 is 87946845282.

28254864978 is a `hidden beast` number, since 2 + 82 + 5 + 486 + 4 + 9 + 78 = 666.

It is a super-3 number, since 3×28254864978³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28254864973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383878 + ... + 451521.

It is an arithmetic number, because the mean of its divisors is an integer number (2552147000).

Almost surely, 2^28254864978 is an apocalyptic number.

28254864978 is an abundant number, since it is smaller than the sum of its proper divisors (32996663022).

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

28254864978 is a wasteful number, since it uses less digits than its factorization.

28254864978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837286 (or 837283 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 63.

The spelling of 28254864978 in words is "twenty-eight billion, two hundred fifty-four million, eight hundred sixty-four thousand, nine hundred seventy-eight".