61811816 has 16 divisors (see below), whose sum is σ = 126433440. Its totient is φ = 28096240.

The previous prime is 61811803. The next prime is 61811821.

61811816 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351116 + ... + 351291.

It is an arithmetic number, because the mean of its divisors is an integer number (7902090).

Almost surely, 2^61811816 is an apocalyptic number.

It is an amenable number.

61811816 is an abundant number, since it is smaller than the sum of its proper divisors (64621624).

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

61811816 is a wasteful number, since it uses less digits than its factorization.

61811816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702424 (or 702420 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 61811816 is about 7862.0490967686. The cubic root of 61811816 is about 395.3883186533.

It can be divided in two parts, 6181 and 1816, that added together give a palindrome (7997).

The spelling of 61811816 in words is "sixty-one million, eight hundred eleven thousand, eight hundred sixteen".