28220552657308 has 24 divisors (see below), whose sum is σ = 53938028874240. Its totient is φ = 12812660043120.

The previous prime is 28220552657303. The next prime is 28220552657329. The reversal of 28220552657308 is 80375625502282.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28220552657303) 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, 371558898 + ... + 371634841.

It is an arithmetic number, because the mean of its divisors is an integer number (2247417869760).

Almost surely, 2^{28220552657308} is an apocalyptic number.

It is an amenable number.

28220552657308 is a deficient number, since it is larger than the sum of its proper divisors (25717476216932).

28220552657308 is a wasteful number, since it uses less digits than its factorization.

28220552657308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743194617 (or 743194615 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 55.

The spelling of 28220552657308 in words is "twenty-eight trillion, two hundred twenty billion, five hundred fifty-two million, six hundred fifty-seven thousand, three hundred eight".