28078747578 has 128 divisors (see below), whose sum is σ = 76570583040. Its totient is φ = 7444120320.

The previous prime is 28078747549. The next prime is 28078747589. The reversal of 28078747578 is 87574787082.

28078747578 is a `hidden beast` number, since 2 + 80 + 7 + 87 + 475 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 425475 + ... + 487017.

It is an arithmetic number, because the mean of its divisors is an integer number (598207680).

Almost surely, 2^28078747578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28078747578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38285291520).

28078747578 is an abundant number, since it is smaller than the sum of its proper divisors (48491835462).

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

28078747578 is a wasteful number, since it uses less digits than its factorization.

28078747578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61649 (or 61643 counting only the distinct ones).

The product of its (nonzero) digits is 49172480, while the sum is 63.

The spelling of 28078747578 in words is "twenty-eight billion, seventy-eight million, seven hundred forty-seven thousand, five hundred seventy-eight".