121625780 has 12 divisors (see below), whose sum is σ = 255414180. Its totient is φ = 48650304.

The previous prime is 121625773. The next prime is 121625789. The reversal of 121625780 is 87526121.

It can be written as a sum of positive squares in 2 ways, for example, as 32398864 + 89226916 = 5692^2 + 9446^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121625789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040625 + ... + 3040664.

It is an arithmetic number, because the mean of its divisors is an integer number (21284515).

Almost surely, 2^121625780 is an apocalyptic number.

121625780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121625780 is an abundant number, since it is smaller than the sum of its proper divisors (133788400).

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

121625780 is a wasteful number, since it uses less digits than its factorization.

121625780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6081298 (or 6081296 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 121625780 is about 11028.4078633319. The cubic root of 121625780 is about 495.4599404931.

The spelling of 121625780 in words is "one hundred twenty-one million, six hundred twenty-five thousand, seven hundred eighty".