61271658 has 72 divisors (see below), whose sum is σ = 155930112. Its totient is φ = 17336592.

The previous prime is 61271653. The next prime is 61271659. The reversal of 61271658 is 85617216.

It is not an unprimeable number, because it can be changed into a prime (61271653) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111741 + ... + 112287.

It is an arithmetic number, because the mean of its divisors is an integer number (2165696).

Almost surely, 2^61271658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61271658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77965056).

61271658 is an abundant number, since it is smaller than the sum of its proper divisors (94658454).

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

61271658 is a wasteful number, since it uses less digits than its factorization.

61271658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 686 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 61271658 is about 7827.6214778182. The cubic root of 61271658 is about 394.2332141593.

The spelling of 61271658 in words is "sixty-one million, two hundred seventy-one thousand, six hundred fifty-eight".