61782645 has 16 divisors (see below), whose sum is σ = 99234432. Its totient is φ = 32823360.

The previous prime is 61782631. The next prime is 61782647. The reversal of 61782645 is 54628716.

It is not a de Polignac number, because 61782645 - 2⁴ = 61782629 is a prime.

It is a super-3 number, since 3×61782645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61782647) 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 15 ways as a sum of consecutive naturals, for example, 3886 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (6202152).

Almost surely, 2^61782645 is an apocalyptic number.

It is an amenable number.

61782645 is a deficient number, since it is larger than the sum of its proper divisors (37451787).

61782645 is a wasteful number, since it uses less digits than its factorization.

61782645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15932.

The product of its digits is 80640, while the sum is 39.

The square root of 61782645 is about 7860.1936999033. The cubic root of 61782645 is about 395.3261100107.

The spelling of 61782645 in words is "sixty-one million, seven hundred eighty-two thousand, six hundred forty-five".