61818620 has 24 divisors (see below), whose sum is σ = 131949888. Its totient is φ = 24321600.

The previous prime is 61818577. The next prime is 61818661. The reversal of 61818620 is 2681816.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 24116 + ... + 26555.

It is an arithmetic number, because the mean of its divisors is an integer number (5497912).

Almost surely, 2^61818620 is an apocalyptic number.

It is an amenable number.

61818620 is an abundant number, since it is smaller than the sum of its proper divisors (70131268).

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

61818620 is a wasteful number, since it uses less digits than its factorization.

61818620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50741 (or 50739 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 61818620 is about 7862.4817964813. The cubic root of 61818620 is about 395.4028257147.

The spelling of 61818620 in words is "sixty-one million, eight hundred eighteen thousand, six hundred twenty".