122591780 has 24 divisors (see below), whose sum is σ = 259995960. Its totient is φ = 48550400.

The previous prime is 122591759. The next prime is 122591783. The reversal of 122591780 is 87195221.

It can be written as a sum of positive squares in 4 ways, for example, as 48080356 + 74511424 = 6934^2 + 8632^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 122591780.

It is not an unprimeable number, because it can be changed into a prime (122591783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28325 + ... + 32364.

It is an arithmetic number, because the mean of its divisors is an integer number (10833165).

Almost surely, 2^122591780 is an apocalyptic number.

122591780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122591780 is an abundant number, since it is smaller than the sum of its proper divisors (137404180).

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

122591780 is a wasteful number, since it uses less digits than its factorization.

122591780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60799 (or 60797 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 122591780 is about 11072.1172320383. The cubic root of 122591780 is about 496.7681958908.

The spelling of 122591780 in words is "one hundred twenty-two million, five hundred ninety-one thousand, seven hundred eighty".