123807780 has 72 divisors (see below), whose sum is σ = 380120832. Its totient is φ = 32613696.

The previous prime is 123807703. The next prime is 123807799. The reversal of 123807780 is 87708321.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10797 + ... + 19083.

It is an arithmetic number, because the mean of its divisors is an integer number (5279456).

Almost surely, 2^123807780 is an apocalyptic number.

123807780 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 123807780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190060416).

123807780 is an abundant number, since it is smaller than the sum of its proper divisors (256313052).

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

123807780 is a wasteful number, since it uses less digits than its factorization.

123807780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385 (or 8380 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 123807780 is about 11126.8944454416. The cubic root of 123807780 is about 498.4052925570.

The spelling of 123807780 in words is "one hundred twenty-three million, eight hundred seven thousand, seven hundred eighty".