61686297 has 12 divisors (see below), whose sum is σ = 90433200. Its totient is φ = 40510008.

The previous prime is 61686259. The next prime is 61686301. The reversal of 61686297 is 79268616.

61686297 is a `hidden beast` number, since 6 + 16 + 8 + 629 + 7 = 666.

It is not a de Polignac number, because 61686297 - 2⁸ = 61686041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61686227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50547 + ... + 51752.

It is an arithmetic number, because the mean of its divisors is an integer number (7536100).

Almost surely, 2^61686297 is an apocalyptic number.

61686297 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

61686297 is a deficient number, since it is larger than the sum of its proper divisors (28746903).

61686297 is a wasteful number, since it uses less digits than its factorization.

61686297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102372 (or 102369 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 61686297 is about 7854.0624520053. The cubic root of 61686297 is about 395.1205037455.

The spelling of 61686297 in words is "sixty-one million, six hundred eighty-six thousand, two hundred ninety-seven".