61129860 has 96 divisors (see below), whose sum is σ = 194890752. Its totient is φ = 14171520.

The previous prime is 61129853. The next prime is 61129877. The reversal of 61129860 is 6892116.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13167 + ... + 17193.

It is an arithmetic number, because the mean of its divisors is an integer number (2030112).

Almost surely, 2^61129860 is an apocalyptic number.

61129860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61129860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97445376).

61129860 is an abundant number, since it is smaller than the sum of its proper divisors (133760892).

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

61129860 is a wasteful number, since it uses less digits than its factorization.

61129860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073 (or 4071 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 61129860 is about 7818.5586907051. The cubic root of 61129860 is about 393.9288610429.

It can be divided in two parts, 61 and 129860, that added together give a palindrome (129921).

The spelling of 61129860 in words is "sixty-one million, one hundred twenty-nine thousand, eight hundred sixty".