123511587780 has 192 divisors, whose sum is σ = 401393664000. Its totient is φ = 27793539072.

The previous prime is 123511587779. The next prime is 123511587809. The reversal of 123511587780 is 87785115321.

It is a super-2 number, since 2×123511587780² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11906436 + ... + 11916804.

It is an arithmetic number, because the mean of its divisors is an integer number (2090592000).

Almost surely, 2^123511587780 is an apocalyptic number.

123511587780 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 123511587780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200696832000).

123511587780 is an abundant number, since it is smaller than the sum of its proper divisors (277882076220).

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

123511587780 is a wasteful number, since it uses less digits than its factorization.

123511587780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10826 (or 10824 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 48.

The spelling of 123511587780 in words is "one hundred twenty-three billion, five hundred eleven million, five hundred eighty-seven thousand, seven hundred eighty".