61689285 has 72 divisors (see below), whose sum is σ = 126070776. Its totient is φ = 27820800.

The previous prime is 61689281. The next prime is 61689317. The reversal of 61689285 is 58298616.

61689285 is a `hidden beast` number, since 616 + 8 + 9 + 28 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11009124 + 50680161 = 3318^2 + 7119^2 .

It is not a de Polignac number, because 61689285 - 2² = 61689281 is a prime.

It is a super-2 number, since 2×61689285² = 7611135767622450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 61689285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61689281) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 222567 + ... + 222843.

It is an arithmetic number, because the mean of its divisors is an integer number (1750983).

Almost surely, 2^61689285 is an apocalyptic number.

It is an amenable number.

61689285 is an abundant number, since it is smaller than the sum of its proper divisors (64381491).

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

61689285 is a wasteful number, since it uses less digits than its factorization.

61689285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 393 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 61689285 is about 7854.2526697325. The cubic root of 61689285 is about 395.1268833417.

The spelling of 61689285 in words is "sixty-one million, six hundred eighty-nine thousand, two hundred eighty-five".