122457780 has 36 divisors (see below), whose sum is σ = 371455812. Its totient is φ = 32655360.

The previous prime is 122457757. The next prime is 122457809. The reversal of 122457780 is 87754221.

122457780 is a `hidden beast` number, since 1 + 2 + 2 + 4 + 577 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 86601636 + 35856144 = 9306^2 + 5988^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339981 + ... + 340340.

It is an arithmetic number, because the mean of its divisors is an integer number (10318217).

Almost surely, 2^122457780 is an apocalyptic number.

122457780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122457780 is an abundant number, since it is smaller than the sum of its proper divisors (248998032).

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

122457780 is a wasteful number, since it uses less digits than its factorization.

122457780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680336 (or 680331 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 122457780 is about 11066.0643410383. The cubic root of 122457780 is about 496.5871309862.

The spelling of 122457780 in words is "one hundred twenty-two million, four hundred fifty-seven thousand, seven hundred eighty".