61540605 has 48 divisors (see below), whose sum is σ = 123502080. Its totient is φ = 27765504.

The previous prime is 61540553. The next prime is 61540607. The reversal of 61540605 is 50604516.

It is a happy number.

61540605 is a `hidden beast` number, since 6 + 1 + 54 + 0 + 605 = 666.

It is not a de Polignac number, because 61540605 - 2⁹ = 61540093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540607) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23649 + ... + 26121.

It is an arithmetic number, because the mean of its divisors is an integer number (2572960).

Almost surely, 2^61540605 is an apocalyptic number.

It is an amenable number.

61540605 is an abundant number, since it is smaller than the sum of its proper divisors (61961475).

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

61540605 is a wasteful number, since it uses less digits than its factorization.

61540605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 61540605 is about 7844.7820237404. The cubic root of 61540605 is about 394.8091905425.

The spelling of 61540605 in words is "sixty-one million, five hundred forty thousand, six hundred five".