61983918 has 24 divisors (see below), whose sum is σ = 134548128. Its totient is φ = 20622912.

The previous prime is 61983913. The next prime is 61983931. The reversal of 61983918 is 81938916.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61983913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7771 + ... + 13577.

It is an arithmetic number, because the mean of its divisors is an integer number (5606172).

Almost surely, 2^61983918 is an apocalyptic number.

61983918 is an abundant number, since it is smaller than the sum of its proper divisors (72564210).

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

61983918 is a wasteful number, since it uses less digits than its factorization.

61983918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408 (or 6405 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 61983918 is about 7872.9865997600. The cubic root of 61983918 is about 395.7549371417.

The spelling of 61983918 in words is "sixty-one million, nine hundred eighty-three thousand, nine hundred eighteen".