61780285 has 16 divisors (see below), whose sum is σ = 85274496. Its totient is φ = 42090048.

The previous prime is 61780283. The next prime is 61780289. The reversal of 61780285 is 58208716.

It is not a de Polignac number, because 61780285 - 2¹ = 61780283 is a prime.

It is a super-2 number, since 2×61780285² = 7633607229362450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61780283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127 + ... + 11116.

It is an arithmetic number, because the mean of its divisors is an integer number (5329656).

Almost surely, 2^61780285 is an apocalyptic number.

It is an amenable number.

61780285 is a deficient number, since it is larger than the sum of its proper divisors (23494211).

61780285 is a wasteful number, since it uses less digits than its factorization.

61780285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11412.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 61780285 is about 7860.0435749428. The cubic root of 61780285 is about 395.3210763344.

The spelling of 61780285 in words is "sixty-one million, seven hundred eighty thousand, two hundred eighty-five".