28133462778 has 16 divisors (see below), whose sum is σ = 56979166080. Its totient is φ = 9259114176.

The previous prime is 28133462771. The next prime is 28133462821. The reversal of 28133462778 is 87726433182.

It is a super-2 number, since 2×28133462778² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28133462778.

It is not an unprimeable number, because it can be changed into a prime (28133462771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29676175 + ... + 29677122.

It is an arithmetic number, because the mean of its divisors is an integer number (3561197880).

Almost surely, 2^28133462778 is an apocalyptic number.

28133462778 is an abundant number, since it is smaller than the sum of its proper divisors (28845703302).

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

28133462778 is a wasteful number, since it uses less digits than its factorization.

28133462778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59353381.

The product of its digits is 2709504, while the sum is 51.

The spelling of 28133462778 in words is "twenty-eight billion, one hundred thirty-three million, four hundred sixty-two thousand, seven hundred seventy-eight".