1220230232928 has 72 divisors (see below), whose sum is σ = 3965748263568. Its totient is φ = 348637208832.

The previous prime is 1220230232927. The next prime is 1220230233049. The reversal of 1220230232928 is 8292320320221.

It is a happy number.

1220230232928 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 2 + 302 + 329 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1220230232928² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1220230232892 and 1220230232901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220230232927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302634451 + ... + 302638482.

It is an arithmetic number, because the mean of its divisors is an integer number (55079836994).

Almost surely, 2^{1220230232928} is an apocalyptic number.

1220230232928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1220230232928 is an abundant number, since it is smaller than the sum of its proper divisors (2745518030640).

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

1220230232928 is a wasteful number, since it uses less digits than its factorization.

1220230232928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605272956 (or 605272945 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 1220230232928 in words is "one trillion, two hundred twenty billion, two hundred thirty million, two hundred thirty-two thousand, nine hundred twenty-eight".