28012223660 has 24 divisors (see below), whose sum is σ = 58898417760. Its totient is φ = 11191032704.

The previous prime is 28012223513. The next prime is 28012223677. The reversal of 28012223660 is 6632221082.

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, 849464 + ... + 881823.

It is an arithmetic number, because the mean of its divisors is an integer number (2454100740).

Almost surely, 2^28012223660 is an apocalyptic number.

28012223660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28012223660 is an abundant number, since it is smaller than the sum of its proper divisors (30886194100).

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

28012223660 is a wasteful number, since it uses less digits than its factorization.

28012223660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732105 (or 1732103 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 28012223660 in words is "twenty-eight billion, twelve million, two hundred twenty-three thousand, six hundred sixty".