28220770540 has 12 divisors (see below), whose sum is σ = 59263618176. Its totient is φ = 11288308208.

The previous prime is 28220770519. The next prime is 28220770541. The reversal of 28220770540 is 4507702282.

It is a self number, because there is not a number n which added to its sum of digits gives 28220770540.

It is not an unprimeable number, because it can be changed into a prime (28220770541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 705519244 + ... + 705519283.

It is an arithmetic number, because the mean of its divisors is an integer number (4938634848).

Almost surely, 2^28220770540 is an apocalyptic number.

28220770540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28220770540 is an abundant number, since it is smaller than the sum of its proper divisors (31042847636).

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

28220770540 is a wasteful number, since it uses less digits than its factorization.

28220770540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411038536 (or 1411038534 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The spelling of 28220770540 in words is "twenty-eight billion, two hundred twenty million, seven hundred seventy thousand, five hundred forty".