61581234 has 48 divisors (see below), whose sum is σ = 145515744. Its totient is φ = 17222400.

The previous prime is 61581199. The next prime is 61581251. The reversal of 61581234 is 43218516.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8394 + ... + 13914.

It is an arithmetic number, because the mean of its divisors is an integer number (3031578).

Almost surely, 2^61581234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61581234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72757872).

61581234 is an abundant number, since it is smaller than the sum of its proper divisors (83934510).

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

61581234 is a wasteful number, since it uses less digits than its factorization.

61581234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563 (or 5550 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 61581234 is about 7847.3711521757. The cubic root of 61581234 is about 394.8960555421.

The spelling of 61581234 in words is "sixty-one million, five hundred eighty-one thousand, two hundred thirty-four".