61706287 has 4 divisors (see below), whose sum is σ = 63834120. Its totient is φ = 59578456.

The previous prime is 61706273. The next prime is 61706291. The reversal of 61706287 is 78260716.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 61706287 - 2²³ = 53317679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61706207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063873 + ... + 1063930.

It is an arithmetic number, because the mean of its divisors is an integer number (15958530).

Almost surely, 2^61706287 is an apocalyptic number.

61706287 is a deficient number, since it is larger than the sum of its proper divisors (2127833).

61706287 is a wasteful number, since it uses less digits than its factorization.

61706287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127832.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 61706287 is about 7855.3349387534. The cubic root of 61706287 is about 395.1631799217.

The spelling of 61706287 in words is "sixty-one million, seven hundred six thousand, two hundred eighty-seven".