61126780 has 144 divisors (see below), whose sum is σ = 159536160. Its totient is φ = 19514880.

The previous prime is 61126771. The next prime is 61126829. The reversal of 61126780 is 8762116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 912307 + ... + 912373.

It is an arithmetic number, because the mean of its divisors is an integer number (1107890).

Almost surely, 2^61126780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61126780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79768080).

61126780 is an abundant number, since it is smaller than the sum of its proper divisors (98409380).

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

61126780 is a wasteful number, since it uses less digits than its factorization.

61126780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 61126780 is about 7818.3617209745. The cubic root of 61126780 is about 393.9222449567.

Adding to 61126780 its reverse (8762116), we get a palindrome (69888896).

The spelling of 61126780 in words is "sixty-one million, one hundred twenty-six thousand, seven hundred eighty".