61620685 has 12 divisors (see below), whose sum is σ = 86017788. Its totient is φ = 42254016.

The previous prime is 61620649. The next prime is 61620701. The reversal of 61620685 is 58602616.

61620685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39162564 + 22458121 = 6258^2 + 4739^2 .

It is not a de Polignac number, because 61620685 - 2¹⁹ = 61096397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61620685.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125512 + ... + 126001.

It is an arithmetic number, because the mean of its divisors is an integer number (7168149).

Almost surely, 2^61620685 is an apocalyptic number.

It is an amenable number.

61620685 is a deficient number, since it is larger than the sum of its proper divisors (24397103).

61620685 is a wasteful number, since it uses less digits than its factorization.

61620685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251532 (or 251525 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 61620685 is about 7849.8843940532. The cubic root of 61620685 is about 394.9803654183.

The spelling of 61620685 in words is "sixty-one million, six hundred twenty thousand, six hundred eighty-five".