61538686 has 8 divisors (see below), whose sum is σ = 100699704. Its totient is φ = 27972120.

The previous prime is 61538683. The next prime is 61538693. The reversal of 61538686 is 68683516.

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

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61538683) 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, 1398585 + ... + 1398628.

It is an arithmetic number, because the mean of its divisors is an integer number (12587463).

Almost surely, 2^61538686 is an apocalyptic number.

61538686 is a deficient number, since it is larger than the sum of its proper divisors (39161018).

61538686 is a wasteful number, since it uses less digits than its factorization.

61538686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797226.

The product of its digits is 207360, while the sum is 43.

The square root of 61538686 is about 7844.6597121864. The cubic root of 61538686 is about 394.8050867657.

The spelling of 61538686 in words is "sixty-one million, five hundred thirty-eight thousand, six hundred eighty-six".