28781443534 has 16 divisors (see below), whose sum is σ = 43686174960. Its totient is φ = 14219599680.

The previous prime is 28781443519. The next prime is 28781443567. The reversal of 28781443534 is 43534418782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219712 + ... + 325324.

It is an arithmetic number, because the mean of its divisors is an integer number (2730385935).

Almost surely, 2^28781443534 is an apocalyptic number.

28781443534 is a deficient number, since it is larger than the sum of its proper divisors (14904731426).

28781443534 is a wasteful number, since it uses less digits than its factorization.

28781443534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107235.

The product of its digits is 2580480, while the sum is 49.

The spelling of 28781443534 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred forty-three thousand, five hundred thirty-four".