61808620 has 12 divisors (see below), whose sum is σ = 129798144. Its totient is φ = 24723440.

The previous prime is 61808597. The next prime is 61808641. The reversal of 61808620 is 2680816.

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, 1545196 + ... + 1545235.

It is an arithmetic number, because the mean of its divisors is an integer number (10816512).

Almost surely, 2^61808620 is an apocalyptic number.

It is an amenable number.

61808620 is an abundant number, since it is smaller than the sum of its proper divisors (67989524).

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

61808620 is a wasteful number, since it uses less digits than its factorization.

61808620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090440 (or 3090438 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 61808620 is about 7861.8458392416. The cubic root of 61808620 is about 395.3815039755.

The spelling of 61808620 in words is "sixty-one million, eight hundred eight thousand, six hundred twenty".