28077144538 has 64 divisors (see below), whose sum is σ = 44547148800. Its totient is φ = 13260983040.

The previous prime is 28077144517. The next prime is 28077144539. The reversal of 28077144538 is 83544177082.

It is a junction number, because it is equal to n+sod(n) for n = 28077144491 and 28077144500.

It is not an unprimeable number, because it can be changed into a prime (28077144539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104375868 + ... + 104376136.

It is an arithmetic number, because the mean of its divisors is an integer number (696049200).

Almost surely, 2^28077144538 is an apocalyptic number.

28077144538 is a deficient number, since it is larger than the sum of its proper divisors (16470004262).

28077144538 is a wasteful number, since it uses less digits than its factorization.

28077144538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 28077144538 in words is "twenty-eight billion, seventy-seven million, one hundred forty-four thousand, five hundred thirty-eight".