228212256640 has 64 divisors (see below), whose sum is σ = 564382728000. Its totient is φ = 88137140224.

The previous prime is 228212256637. The next prime is 228212256661. The reversal of 228212256640 is 46652212822.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 228212256593 and 228212256602.

It is a congruent number.

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, 6129400 + ... + 6166519.

It is an arithmetic number, because the mean of its divisors is an integer number (8818480125).

Almost surely, 2^228212256640 is an apocalyptic number.

228212256640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228212256640 is an abundant number, since it is smaller than the sum of its proper divisors (336170471360).

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

228212256640 is a wasteful number, since it uses less digits than its factorization.

228212256640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12295967 (or 12295955 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 228212256640 in words is "two hundred twenty-eight billion, two hundred twelve million, two hundred fifty-six thousand, six hundred forty".