61697900 has 54 divisors (see below), whose sum is σ = 147191100. Its totient is φ = 22431200.

The previous prime is 61697873. The next prime is 61697903. The reversal of 61697900 is 979616.

61697900 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

61697900 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (61697903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9551 + ... + 14649.

Almost surely, 2^61697900 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 61697900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73595550).

61697900 is an abundant number, since it is smaller than the sum of its proper divisors (85493200).

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

61697900 is a wasteful number, since it uses less digits than its factorization.

61697900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5135 (or 5117 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 61697900 is about 7854.8010795946. The cubic root of 61697900 is about 395.1452758371.

The spelling of 61697900 in words is "sixty-one million, six hundred ninety-seven thousand, nine hundred".