61785534 has 16 divisors (see below), whose sum is σ = 124033680. Its totient is φ = 20518080.

The previous prime is 61785533. The next prime is 61785547. The reversal of 61785534 is 43558716.

It is a junction number, because it is equal to n+sod(n) for n = 61785492 and 61785501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61785533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17527 + ... + 20754.

It is an arithmetic number, because the mean of its divisors is an integer number (7752105).

Almost surely, 2^61785534 is an apocalyptic number.

61785534 is an abundant number, since it is smaller than the sum of its proper divisors (62248146).

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

61785534 is a wasteful number, since it uses less digits than its factorization.

61785534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38555.

The product of its digits is 100800, while the sum is 39.

The square root of 61785534 is about 7860.3774718521. The cubic root of 61785534 is about 395.3322718238.

The spelling of 61785534 in words is "sixty-one million, seven hundred eighty-five thousand, five hundred thirty-four".