122658820 has 24 divisors (see below), whose sum is σ = 258111000. Its totient is φ = 48963072.

The previous prime is 122658799. The next prime is 122658829. The reversal of 122658820 is 28856221.

It can be written as a sum of positive squares in 4 ways, for example, as 37724164 + 84934656 = 6142^2 + 9216^2 .

It is a super-2 number, since 2×122658820² = 30090372247584800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (122658829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156 + ... + 16204.

It is an arithmetic number, because the mean of its divisors is an integer number (10754625).

Almost surely, 2^122658820 is an apocalyptic number.

122658820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122658820 is an abundant number, since it is smaller than the sum of its proper divisors (135452180).

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

122658820 is a wasteful number, since it uses less digits than its factorization.

122658820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12567 (or 12565 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 122658820 is about 11075.1442428530. The cubic root of 122658820 is about 496.8587328772.

The spelling of 122658820 in words is "one hundred twenty-two million, six hundred fifty-eight thousand, eight hundred twenty".