28778057154 has 96 divisors (see below), whose sum is σ = 77792158080. Its totient is φ = 7469625600.

The previous prime is 28778057141. The next prime is 28778057167. The reversal of 28778057154 is 45175087782.

It is an interprime number because it is at equal distance from previous prime (28778057141) and next prime (28778057167).

It is a self number, because there is not a number n which added to its sum of digits gives 28778057154.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2240302 + ... + 2253110.

It is an arithmetic number, because the mean of its divisors is an integer number (810334980).

Almost surely, 2^28778057154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28778057154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38896079040).

28778057154 is an abundant number, since it is smaller than the sum of its proper divisors (49014100926).

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

28778057154 is a wasteful number, since it uses less digits than its factorization.

28778057154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14456 (or 14453 counting only the distinct ones).

The product of its (nonzero) digits is 4390400, while the sum is 54.

The spelling of 28778057154 in words is "twenty-eight billion, seven hundred seventy-eight million, fifty-seven thousand, one hundred fifty-four".