61908687 has 6 divisors (see below), whose sum is σ = 89423672. Its totient is φ = 41272452.

The previous prime is 61908677. The next prime is 61908689. The reversal of 61908687 is 78680916.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-61908687 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 (61908689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3439363 + ... + 3439380.

Almost surely, 2^61908687 is an apocalyptic number.

61908687 is a deficient number, since it is larger than the sum of its proper divisors (27514985).

61908687 is a wasteful number, since it uses less digits than its factorization.

61908687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6878749 (or 6878746 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 61908687 is about 7868.2073561898. The cubic root of 61908687 is about 395.5947606845.

The spelling of 61908687 in words is "sixty-one million, nine hundred eight thousand, six hundred eighty-seven".