122520640 has 56 divisors (see below), whose sum is σ = 318284352. Its totient is φ = 44551680.

The previous prime is 122520637. The next prime is 122520641. The reversal of 122520640 is 46025221.

It is a super-2 number, since 2×122520640² = 30022614452019200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (122520641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13884 + ... + 20923.

Almost surely, 2^122520640 is an apocalyptic number.

122520640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122520640 is an abundant number, since it is smaller than the sum of its proper divisors (195763712).

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

122520640 is a wasteful number, since it uses less digits than its factorization.

122520640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34835 (or 34825 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 122520640 is about 11068.9041914726. The cubic root of 122520640 is about 496.6720857829.

Adding to 122520640 its reverse (46025221), we get a palindrome (168545861).

The spelling of 122520640 in words is "one hundred twenty-two million, five hundred twenty thousand, six hundred forty".