123720870 has 64 divisors (see below), whose sum is σ = 365460480. Its totient is φ = 26103168.

The previous prime is 123720869. The next prime is 123720893. The reversal of 123720870 is 78027321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19930 + ... + 25389.

It is an arithmetic number, because the mean of its divisors is an integer number (5710320).

Almost surely, 2^123720870 is an apocalyptic number.

123720870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123720870 is an abundant number, since it is smaller than the sum of its proper divisors (241739610).

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

123720870 is a wasteful number, since it uses less digits than its factorization.

123720870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45349.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 123720870 is about 11122.9883574514. The cubic root of 123720870 is about 498.2886425274.

The spelling of 123720870 in words is "one hundred twenty-three million, seven hundred twenty thousand, eight hundred seventy".