61198818 has 16 divisors (see below), whose sum is σ = 122912640. Its totient is φ = 20313776.

The previous prime is 61198771. The next prime is 61198831. The reversal of 61198818 is 81889116.

It is a self number, because there is not a number n which added to its sum of digits gives 61198818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19905 + ... + 22772.

It is an arithmetic number, because the mean of its divisors is an integer number (7682040).

Almost surely, 2^61198818 is an apocalyptic number.

61198818 is an abundant number, since it is smaller than the sum of its proper divisors (61713822).

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

61198818 is a wasteful number, since it uses less digits than its factorization.

61198818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42921.

The product of its digits is 27648, while the sum is 42.

The square root of 61198818 is about 7822.9673398270. The cubic root of 61198818 is about 394.0769301884.

The spelling of 61198818 in words is "sixty-one million, one hundred ninety-eight thousand, eight hundred eighteen".