61097980 has 12 divisors (see below), whose sum is σ = 128305800. Its totient is φ = 24439184.

The previous prime is 61097957. The next prime is 61097987. The reversal of 61097980 is 8979016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61097987) 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, 1527430 + ... + 1527469.

It is an arithmetic number, because the mean of its divisors is an integer number (10692150).

Almost surely, 2^61097980 is an apocalyptic number.

It is an amenable number.

61097980 is an abundant number, since it is smaller than the sum of its proper divisors (67207820).

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

61097980 is a wasteful number, since it uses less digits than its factorization.

61097980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054908 (or 3054906 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 61097980 is about 7816.5196858960. The cubic root of 61097980 is about 393.8603694969.

The spelling of 61097980 in words is "sixty-one million, ninety-seven thousand, nine hundred eighty".