61123900 has 36 divisors (see below), whose sum is σ = 134522640. Its totient is φ = 24102400.

The previous prime is 61123897. The next prime is 61123901. The reversal of 61123900 is 932116.

It is a super-2 number, since 2×61123900² = 7472262302420000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2796 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (3736740).

Almost surely, 2^61123900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61123900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67261320).

61123900 is an abundant number, since it is smaller than the sum of its proper divisors (73398740).

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

61123900 is a wasteful number, since it uses less digits than its factorization.

61123900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8694 (or 8687 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 61123900 is about 7818.1775369967. The cubic root of 61123900 is about 393.9160582854.

The spelling of 61123900 in words is "sixty-one million, one hundred twenty-three thousand, nine hundred".