61671620 has 12 divisors (see below), whose sum is σ = 129510444. Its totient is φ = 24668640.

The previous prime is 61671619. The next prime is 61671653. The reversal of 61671620 is 2617616.

It can be written as a sum of positive squares in 2 ways, for example, as 30846916 + 30824704 = 5554^2 + 5552^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541771 + ... + 1541810.

It is an arithmetic number, because the mean of its divisors is an integer number (10792537).

Almost surely, 2^61671620 is an apocalyptic number.

It is an amenable number.

61671620 is an abundant number, since it is smaller than the sum of its proper divisors (67838824).

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

61671620 is a wasteful number, since it uses less digits than its factorization.

61671620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083590 (or 3083588 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 61671620 is about 7853.1280391956. The cubic root of 61671620 is about 395.0891642968.

The spelling of 61671620 in words is "sixty-one million, six hundred seventy-one thousand, six hundred twenty".