61328840 has 16 divisors (see below), whose sum is σ = 137989980. Its totient is φ = 24531520.

The previous prime is 61328837. The next prime is 61328849. The reversal of 61328840 is 4882316.

It can be written as a sum of positive squares in 2 ways, for example, as 49646116 + 11682724 = 7046^2 + 3418^2 .

It is a super-2 number, since 2×61328840² = 7522453231491200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61328797 and 61328806.

It is not an unprimeable number, because it can be changed into a prime (61328849) 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, 766571 + ... + 766650.

Almost surely, 2^61328840 is an apocalyptic number.

It is an amenable number.

61328840 is an abundant number, since it is smaller than the sum of its proper divisors (76661140).

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

61328840 is a wasteful number, since it uses less digits than its factorization.

61328840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533232 (or 1533228 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 61328840 is about 7831.2732042753. The cubic root of 61328840 is about 394.3558158930.

The spelling of 61328840 in words is "sixty-one million, three hundred twenty-eight thousand, eight hundred forty".