61138616 has 32 divisors (see below), whose sum is σ = 142922880. Its totient is φ = 23820000.

The previous prime is 61138601. The next prime is 61138619. The reversal of 61138616 is 61683116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61138619) 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, 49010 + ... + 50241.

It is an arithmetic number, because the mean of its divisors is an integer number (4466340).

Almost surely, 2^61138616 is an apocalyptic number.

It is an amenable number.

61138616 is an abundant number, since it is smaller than the sum of its proper divisors (81784264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61138616 is a wasteful number, since it uses less digits than its factorization.

61138616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99275 (or 99271 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 61138616 is about 7819.1186204073. The cubic root of 61138616 is about 393.9476684170.

The spelling of 61138616 in words is "sixty-one million, one hundred thirty-eight thousand, six hundred sixteen".