122720736 has 24 divisors (see below), whose sum is σ = 322142184. Its totient is φ = 40906880.

The previous prime is 122720711. The next prime is 122720813. The reversal of 122720736 is 637027221.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 639075 + ... + 639266.

It is an arithmetic number, because the mean of its divisors is an integer number (13422591).

Almost surely, 2^122720736 is an apocalyptic number.

122720736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

122720736 is an abundant number, since it is smaller than the sum of its proper divisors (199421448).

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

122720736 is a wasteful number, since it uses less digits than its factorization.

122720736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278354 (or 1278346 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 122720736 is about 11077.9391585258. The cubic root of 122720736 is about 496.9423206439.

Adding to 122720736 its reverse (637027221), we get a palindrome (759747957).

The spelling of 122720736 in words is "one hundred twenty-two million, seven hundred twenty thousand, seven hundred thirty-six".