61811898 has 48 divisors (see below), whose sum is σ = 134539680. Its totient is φ = 18918144.

The previous prime is 61811839. The next prime is 61811903. The reversal of 61811898 is 89811816.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74148 + ... + 74976.

It is an arithmetic number, because the mean of its divisors is an integer number (2802910).

Almost surely, 2^61811898 is an apocalyptic number.

61811898 is an abundant number, since it is smaller than the sum of its proper divisors (72727782).

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

61811898 is a wasteful number, since it uses less digits than its factorization.

61811898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 894 counting only the distinct ones).

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

The square root of 61811898 is about 7862.0543116923. The cubic root of 61811898 is about 395.3884934949.

The spelling of 61811898 in words is "sixty-one million, eight hundred eleven thousand, eight hundred ninety-eight".