123256280 has 64 divisors (see below), whose sum is σ = 317952000. Its totient is φ = 42125184.

The previous prime is 123256277. The next prime is 123256321. The reversal of 123256280 is 82652321.

It is a super-2 number, since 2×123256280² = 30384221118876800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133661 + ... + 134579.

It is an arithmetic number, because the mean of its divisors is an integer number (4968000).

Almost surely, 2^123256280 is an apocalyptic number.

123256280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123256280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158976000).

123256280 is an abundant number, since it is smaller than the sum of its proper divisors (194695720).

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

123256280 is a wasteful number, since it uses less digits than its factorization.

123256280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 123256280 is about 11102.0844889597. The cubic root of 123256280 is about 497.6641445519.

The spelling of 123256280 in words is "one hundred twenty-three million, two hundred fifty-six thousand, two hundred eighty".