28781542156 has 24 divisors (see below), whose sum is σ = 50671005840. Its totient is φ = 14304325632.

The previous prime is 28781542151. The next prime is 28781542157. The reversal of 28781542156 is 65124518782.

It is not an unprimeable number, because it can be changed into a prime (28781542151) 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, 520780 + ... + 573388.

It is an arithmetic number, because the mean of its divisors is an integer number (2111291910).

Almost surely, 2^28781542156 is an apocalyptic number.

It is an amenable number.

28781542156 is a deficient number, since it is larger than the sum of its proper divisors (21889463684).

28781542156 is a wasteful number, since it uses less digits than its factorization.

28781542156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53433 (or 53431 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The spelling of 28781542156 in words is "twenty-eight billion, seven hundred eighty-one million, five hundred forty-two thousand, one hundred fifty-six".