61123830 has 64 divisors (see below), whose sum is σ = 150847488. Its totient is φ = 15845760.

The previous prime is 61123819. The next prime is 61123831. The reversal of 61123830 is 3832116.

It is a super-2 number, since 2×61123830² = 7472245187737800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61123830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232279 + ... + 232541.

It is an arithmetic number, because the mean of its divisors is an integer number (2356992).

Almost surely, 2^61123830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61123830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75423744).

61123830 is an abundant number, since it is smaller than the sum of its proper divisors (89723658).

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

61123830 is a wasteful number, since it uses less digits than its factorization.

61123830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61123830 is about 7818.1730602488. The cubic root of 61123830 is about 393.9159079125.

Adding to 61123830 its reverse (3832116), we get a palindrome (64955946).

The spelling of 61123830 in words is "sixty-one million, one hundred twenty-three thousand, eight hundred thirty".