61085578 has 4 divisors (see below), whose sum is σ = 91628370. Its totient is φ = 30542788.

The previous prime is 61085567. The next prime is 61085579. The reversal of 61085578 is 87558016.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 6517809 = 7387^2 + 2553^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 61085578.

It is not an unprimeable number, because it can be changed into a prime (61085579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15271393 + ... + 15271396.

Almost surely, 2^61085578 is an apocalyptic number.

61085578 is a deficient number, since it is larger than the sum of its proper divisors (30542792).

61085578 is a wasteful number, since it uses less digits than its factorization.

61085578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30542791.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 61085578 is about 7815.7263258126. The cubic root of 61085578 is about 393.8337183875.

The spelling of 61085578 in words is "sixty-one million, eighty-five thousand, five hundred seventy-eight".