61871687 has 8 divisors (see below), whose sum is σ = 65844000. Its totient is φ = 57936384.

The previous prime is 61871683. The next prime is 61871699. The reversal of 61871687 is 78617816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61871687 - 2² = 61871683 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 (61871683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5762 + ... + 12527.

It is an arithmetic number, because the mean of its divisors is an integer number (8230500).

Almost surely, 2^61871687 is an apocalyptic number.

61871687 is a deficient number, since it is larger than the sum of its proper divisors (3972313).

61871687 is a wasteful number, since it uses less digits than its factorization.

61871687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18505.

The product of its digits is 112896, while the sum is 44.

The square root of 61871687 is about 7865.8557703533. The cubic root of 61871687 is about 395.5159353274.

The spelling of 61871687 in words is "sixty-one million, eight hundred seventy-one thousand, six hundred eighty-seven".