123445678890 has 32 divisors (see below), whose sum is σ = 309150919296. Its totient is φ = 31487593280.

The previous prime is 123445678883. The next prime is 123445678919. The reversal of 123445678890 is 98876544321.

It is a happy number.

It is a super-2 number, since 2×123445678890² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 123445678890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89452701 + ... + 89454080.

It is an arithmetic number, because the mean of its divisors is an integer number (9660966228).

It is a 2-persistent number, because it is pandigital, and so is 2⋅123445678890 = 246891357780, but 3⋅123445678890 = 370337036670 is not.

Almost surely, 2^123445678890 is an apocalyptic number.

123445678890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123445678890 is an abundant number, since it is smaller than the sum of its proper divisors (185705240406).

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

123445678890 is a wasteful number, since it uses less digits than its factorization.

123445678890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178906814.

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 123445678890 in words is "one hundred twenty-three billion, four hundred forty-five million, six hundred seventy-eight thousand, eight hundred ninety".