61123520 has 56 divisors (see below), whose sum is σ = 146322288. Its totient is φ = 24320000.

The previous prime is 61123507. The next prime is 61123523. The reversal of 61123520 is 2532116.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61123492 and 61123501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61123523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79940 + ... + 80700.

It is an arithmetic number, because the mean of its divisors is an integer number (2612898).

Almost surely, 2^61123520 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 61123520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73161144).

61123520 is an abundant number, since it is smaller than the sum of its proper divisors (85198768).

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

61123520 is a wasteful number, since it uses less digits than its factorization.

61123520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61123520 is about 7818.1532346201. The cubic root of 61123520 is about 393.9152419740.

Adding to 61123520 its reverse (2532116), we get a palindrome (63655636).

The spelling of 61123520 in words is "sixty-one million, one hundred twenty-three thousand, five hundred twenty".