61065820 has 12 divisors (see below), whose sum is σ = 128238264. Its totient is φ = 24426320.

The previous prime is 61065817. The next prime is 61065847. The reversal of 61065820 is 2856016.

It is a congruent number.

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, 1526626 + ... + 1526665.

It is an arithmetic number, because the mean of its divisors is an integer number (10686522).

Almost surely, 2^61065820 is an apocalyptic number.

It is an amenable number.

61065820 is an abundant number, since it is smaller than the sum of its proper divisors (67172444).

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

61065820 is a wasteful number, since it uses less digits than its factorization.

61065820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053300 (or 3053298 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 61065820 is about 7814.4622335769. The cubic root of 61065820 is about 393.7912522497.

It can be divided in two parts, 610 and 65820, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 61065820 in words is "sixty-one million, sixty-five thousand, eight hundred twenty".