28345309356 has 72 divisors (see below), whose sum is σ = 81849218304. Its totient is φ = 7475682240.

The previous prime is 28345309337. The next prime is 28345309393. The reversal of 28345309356 is 65390354382.

It is a super-2 number, since 2×28345309356² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 984160 + ... + 1012551.

Almost surely, 2^28345309356 is an apocalyptic number.

28345309356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28345309356 is an abundant number, since it is smaller than the sum of its proper divisors (53503908948).

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

28345309356 is a wasteful number, since it uses less digits than its factorization.

28345309356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996751 (or 1996736 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 28345309356 in words is "twenty-eight billion, three hundred forty-five million, three hundred nine thousand, three hundred fifty-six".