61080720 has 80 divisors (see below), whose sum is σ = 190196160. Its totient is φ = 16215552.

The previous prime is 61080713. The next prime is 61080737. The reversal of 61080720 is 2708016.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73266 + ... + 74094.

It is an arithmetic number, because the mean of its divisors is an integer number (2377452).

Almost surely, 2^61080720 is an apocalyptic number.

61080720 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 61080720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95098080).

61080720 is an abundant number, since it is smaller than the sum of its proper divisors (129115440).

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

61080720 is a wasteful number, since it uses less digits than its factorization.

61080720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 1146 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 61080720 is about 7815.4155359776. The cubic root of 61080720 is about 393.8232778712.

Adding to 61080720 its reverse (2708016), we get a palindrome (63788736).

The spelling of 61080720 in words is "sixty-one million, eighty thousand, seven hundred twenty".