28478574788 has 6 divisors (see below), whose sum is σ = 49837505886. Its totient is φ = 14239287392.

The previous prime is 28478574779. The next prime is 28478574823. The reversal of 28478574788 is 88747587482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16936940164 + 11541634624 = 130142^2 + 107432^2 .

It is a super-2 number, since 2×28478574788² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3559821845 + ... + 3559821852.

It is an arithmetic number, because the mean of its divisors is an integer number (8306250981).

Almost surely, 2^28478574788 is an apocalyptic number.

It is an amenable number.

28478574788 is a deficient number, since it is larger than the sum of its proper divisors (21358931098).

28478574788 is a wasteful number, since it uses less digits than its factorization.

28478574788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7119643701 (or 7119643699 counting only the distinct ones).

The product of its digits is 224788480, while the sum is 68.

The spelling of 28478574788 in words is "twenty-eight billion, four hundred seventy-eight million, five hundred seventy-four thousand, seven hundred eighty-eight".