61581498 has 48 divisors (see below), whose sum is σ = 136311168. Its totient is φ = 18532800.

The previous prime is 61581493. The next prime is 61581539. The reversal of 61581498 is 89418516.

It is not an unprimeable number, because it can be changed into a prime (61581493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196590 + ... + 196902.

It is an arithmetic number, because the mean of its divisors is an integer number (2839816).

Almost surely, 2^61581498 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61581498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68155584).

61581498 is an abundant number, since it is smaller than the sum of its proper divisors (74729670).

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

61581498 is a wasteful number, since it uses less digits than its factorization.

61581498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611 (or 600 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 61581498 is about 7847.3879730774. The cubic root of 61581498 is about 394.8966198504.

The spelling of 61581498 in words is "sixty-one million, five hundred eighty-one thousand, four hundred ninety-eight".